Chris R. Ladner, LEED Fellow, CEM, CxA


Chris has a B.S. in engineering from Iowa State and is a LEED Fellow,  LEED Accredited Professional in Building Design and Construction, Certified Energy Manager (CEM), and Certified Commissioning Authority. Through his previous experience Chris has expertise in building HVAC systems, performance contracting, controls as well as knowledge of industrial controls.

In 2008, Chris was a Commissioner on the Arkansas Governor’s Commission on Global Warming. Through this commission greenhouse gas reduction policies will be developed for the Governor and Arkansas Legislators.

As a consultant to the Clinton Climate Initiative, Chris works with cities and other institutions to reduce their greenhouse gas emissions.

Chris currently serves as Chair of the U.S. Green Building Council National Chapter Steering Committee and holds positions on various USGBC sub-committees. He is an Arkansas delegate to the USGBC Southeast Regional Council and the regional Co-Chair. His past positions with the Arkansas Chapter of the USGBC include Chair, Vice-Chair, Secretary, and coordinator of the annual Sustainable Arkansas conference.

Chris has participated in various types of LEED projects including: LEED-Neighborhood Development, LEED-Commercial Interiors, LEED-New Construction, LEED for Existing Buildings, and LEED-Homes.

As the team leader of a volunteer design team Chris is helping the Argenta Community Development Center in North Little Rock, Arkansas with their Green Homes project. The project is an effort to demonstrate the financial, environmental, and occupant benefits of the LEED-Homes sustainable standard inan affordable home project.

Chris has presented on sustainable design and construction to various groups including Master Speaker at the USGBC Greenbuild Conference, American Planning Association, National Environmental Balancing Bureau (NEBB), the American Society of Heating Refrigeration and Air Conditioning Engineers (ASHRAE), graduate architecture programs, and various sustainability conferences.

Matthew Bell, CEM, LEED AP BD+C


Matt holds B.S.  in Business Administration from University of Arkansas, is a LEED Accredited Professional in Building Design and Construction and a Certified Energy Manager (CEM). His previous experience brings expertise in construction estimation and project management.

Previously, Matt was an executive in the construction industry as co-founder of Bell-Corley Construction, a commercial general contracting firm located in Little Rock. While at BCC, Matt Bell and Boyd Corley were recognized locally by Arkansas Business Magazine and nominated for Business of the Year in both 2005 and 2006. Nationally BCC was recognized by Entrepreneur Magazine as a member of the HOT 100 fastest growing businesses ranking 26th and the Inc Magazine Inc. 500 as the 44th fastest growing company in 2006. In 2005, Arkansas Business Publishing recognized Matt as business leader and he was selected to the “40 under 40″ list of upcoming business and political leaders in Arkansas under 40 years of age.

Matt recently served as the Chair of the Green Schools Advocacy Committee through the USGBC Arkansas Chapter and currently serves as a chair member on the committee. Additionally, Matt currently serves as Vice-Chairman for the Keep Arkansas Beautiful Commission.

Current responsibilities include providing sustainable design and construction assistance to owners, architects, engineers, and contractors to enhance their ability to budget, plan, design, and finance a facility that respects occupant needs, financial responsibilities, and the environment. Primarily responsible for the project management of all LEED New Construction projects and coordination of all project team member responsibilities.

Tim Staley, PE, CEM, LEED AP

Vice President of Sales

Tim holds a B.S. in Mechanical Engineering from Louisiana Tech University and is a graduate of Rice University Graduate School of Business. He brings more than 25 years of experience in the area of energy engineering and commissioning, he is a licensed Professional Engineer (AL, AR, KS, MS, TX), Certified Energy Manager, and LEED Accredited Professional. In 2014, he was selected to serve on the Health Care Institute Board of Directors.

Based on experience and specialized areas of expertise, Tim has developed the ability to understand the strategic goals of a building owner as well as the engineering details associated with proper building system performance. One of Tim’s core beliefs is that teamwork and advocating the client’s best interest are fundamental to project success.

As a faculty member for the American Society of Healthcare Engineers, Tim has educated others on mechanical, electrical, and plumbing systems as well as construction and commissioning. In 2010, Tim was a contributing author for Commissioning Guidelines Handbook and a reviewer for the Commissioning Guidelines.

Tim is experienced with various types of clients including: government, institutional, healthcare, higher education, research, K-12 schools, commercial office buildings, industrial, and others. He has various types of project experience including distributed generation/combined heat and power, district heating/cooling systems and heat pump chillers, and campus lighting, energy, and control retrofits.

Current responsibilities include business development, commissioning, retro-commissioning, energy asset management, energy asset monetization, utility negotiations, and other energy related services.

April Ambrose, LEED AP BD+C

Territory Manager/Senior Project Manager

April received her B.A. in a self-designed Environmental Education major, which included an Arkansas high school teaching certificate, from Hendrix College in Conway, Arkansas. April is a LEED Accredited Professional in Building Design and Construction.

April is a graduate of the University of Arkansas, Division of Agriculture LeadAR Class 13.  LeadAR is a two-year program dedicated to the education of Arkansas’ emerging leaders on the economic and social changes affecting the state. In  2014, April graduated from Leadership Greater Little Rock Class XXIX, was recognized by Arkansas Business on the 40 Under 40 list of the most intriguing business and political leaders who bear watching, and was named as USGBC Arkansas Central Branch Member of the Year. April is an active member of USBGC Memphis Regional Chapter, was recently named to the 2015 AIA Memphis Board of Directors, and serves on the Memphis and Shelby County Office of Sustainability Advisory Committee.

She has presented on sustainability to various groups including: Global Reporting Initiative’s Sustainability Conference, BOMA GLR’s Spring Education Day, National Women’s Leadership Summit, American Society of Interior Designers, LeadAR, Arkansas Municipal League, Pulaski County Democratic Committee, Arkansas Business Publishing Group’s Green Guide, U.S. Green Building Council’s Sustainable Arkansas, Little Rock Sustainability Summit, Little Rock Racial & Cultural Diversity Commission and National Guard Women’s Speaker Series, Arkansas Festival Association Conference, USGBC Arkansas, Memphis, and Louisiana Chapter Branches and Residential Discussion Group, IIDA, AIA Memphis, Rotary Clubs, and many local colleges/universities, environmental groups, and media outlets.

April’s current responsibilities as Territory Manager include expanding the Viridian market from Arkansas into West Tennessee, Mississippi, and Alabama.  Additional responsibilities include project management of LEED and sustainability consulting projects with design and construction teams and development of sustainability related continuing education presentations.

John Coleman, PE, LEED AP BD+C

NWA Regional Office/Director

John is a graduate of the University of Arkansas’ College of Engineering. He is a licensed professional engineer in the state of Arkansas and Oklahoma and is a LEED Accredited Professional in Building Design and Construction.

John spent five years as an environmental engineer in the Chesapeake Bay and Mississippi River delta watersheds before moving to Austin, Texas to study environmental policy and sustainable development at the University of Texas.  While in Austin, John worked in the City Manager’s Office developing Austin’s Climate Protection Plan and Austin’s CarShare program. In May 2007, he moved to Fayetteville as the City’s Sustainability Director and worked on a variety of issues including energy management, economic development, and energy policy.

In 2014, John was named to the Forty Under 40 list by the Northwest Arkansas Business Journal. This annual list of young business leaders are said to be the best and brightest in their industry. Currently, he serves as Chair for the U.S. Green Building Council Western Arkansas Chapter Steering Committee, Elevate Board Member, and Fayetteville Natural Heritage Association Board Member. Other professional memberships include the Legislative Task Force on Sustainable Buildings and Design and Arkansas Building Authority Revolving Loan Committee.

Current responsibilities include managing the Northwest Arkansas Viridian office, sustainability consulting, and managing energy services projects related to commissioning and building performance testing.

Patrick HerronPatrick

Territory Manager

Patrick has nearly 30 years of experience in customer, product and business management, and engineering. He is a seasoned business leader in managing teams, implementing contracts, and providing technical solutions to clients in semiconductor manufacturing and commercial construction. His knowledge reaches a vast market segment that includes healthcare, education, commercial office, civic and retail.

Most recently, Patrick worked as an account executive for View Inc, a high performance architectural glass manufacturer with responsibilities for the Dallas/Fort Worth area.

Patrick’s current responsibilities include consulting with North Texas design, construction, and operations personnel to enhance their ability to build and operate sustainable buildings that meet the need of owners and occupants. Additional responsibilities include growing Viridian’s presence in the North Texas region.

Rick Vance, CEM, CxA, LEED AP BD+C

Energy Services/Senior Project Manager

Through his previous professional experience, Rick has gained expertise in sustainable business development and LEED certification for a range of large scale, international projects including hotels, high-rise residential and commercial buildings, and community developments. In addition, Rick has worked with global companies to develop organizational energy and carbon management policies, including low carbon product development and connected real estate services. Rick has participated in various types of LEED projects including: LEED-Neighborhood Development, LEED-Commercial Interiors, LEED-New Construction and LEED for Existing Buildings.

In 2009, Rick was a Team Advisor for the Greenland Quest, an unsupported vertical crossing of the Greenland icecap to raise awareness of global warming is-sues and the need for sustainability. Through his participation, Rick advised team members and supporters on sustainable development practices.

In addition to international work, Rick has developed and managed local, sustainable projects in Little Rock including community events and green business ventures. As Executive Director of the MacArthur Park 5k Race and Evening Event, Rick and his team built an annual fund raising event that supports community improvement of the downtown Little Rock area.

Rick has presented on sustainable development and energy management to various groups including the Dubai Environment, Health, and Safety (EHS) regulating authority, RealComm and BOMA, Dubai International Business Women Group, and the Global Project and Process Management Association.

Rick’s current responsibilities include new construction energy services including fundamental and enhanced commissioning, building envelope commissioning and indoor air quality testing, energy management business development and project stakeholder training and education.

Michael Barnett, PE, HDPA, CEM

Energy Services/Senior Project Manager

Michael holds a B.S. in Mechanical Engineering from Messiah College in Grantham, PA. He is a registered Professional Engineer as well as a Hospital Facility Design Professional and Certified Energy Manager.

Michael has a total of 18 years of experience in designing and managing the design of mechanical, electrical, plumbing and fire protection systems for Hospitals and Higher Education facilities, as well as various other commercial buildings.

His project experience includes the design of multiple different types of HVAC systems, including chilled water plants, heating water systems, Variable Air Volume (VAV) airside systems, Variable Refrigerant Volume (VRV) systems, and other systems. Project design experience includes numerous Hospital, Higher Education, Commercial, Municipal, and Church projects.  Michael has also been responsible for managing the design of all building systems on projects for the last 7 years.

Current responsibilities include management of Existing Building Energy Services including Energy Modeling, Measurement and Verification, Energy Assessments and Retro-Commissioning, as well as building electrical and mechanical design review.

Former responsibilities include HVAC design engineering, project management, team management and a Managing Principal role at a consulting engineering firm.

Samantha McElroySam

Office Manager/HR

Samantha joined Viridian in 2010 and has whipped us into shape over the years. Prior to joining Viridian, she worked with AOL-Time Warner assisting the Managing Director of AOL CityGuide with operations and staffing for a 30-person team.

She also handled recruiting and screening for new hires and has extensive experience handling executives, office staff, and managing complexities of office life.

Current responsibilities include recruiting, new employee relations, liaising with insurance companies, juggling multiple tasks, and making sure the office runs as seamless as possible.

Chad Oppenhuizen, RLA, LEED AP BD+C, O+M

Sustainability Consultant/Senior Project Manager

Chad holds a Bachelor of Landscape Architecture from Iowa State University, and is an Arkansas Registered Landscape Architect. Chad is a LEED Accredited Professional in Building Design and Construction, and Operations and Maintenance.

Chad served as a Landscape Architect and Project Manager for MESA Landscape Architects. Here he worked on a wide range of project types including broad based master planning and constructed projects with a focus on recreational, zoological, and botanical projects for public and private clients.

Chad has multiple years of experience working on large multi-disciplinary projects where he was responsible for the coordination between architects, engineers, planners, designers, contractors, government agencies, and clients. As the point of contact for the daily management of multiple projects, Chad ensured each project met individual design benchmarks on time. As such, he was responsible for the creation and maintenance of cost estimates, schedules, and construction documents. Additionally, he directed submittals, change orders, RFIs, pay requests, and various other details required to successfully manage construction projects and maintain client satisfaction.

Kevin Perri, CCP, CEM, LEED AP 

Energy Services/Project Manager

After studying Mechanical Engineering at Valparaiso University, Kevin worked as an energy auditor for a national and state funded project to reduce carbon emissions. It was during this time Kevin wanted to expand his knowledge to a bigger projects and he did so by completing an internship with Viridian.

With his background and education of energy efficiency and building envelopes, Kevin has the experience and knowledge to ensure important details are addressed during the construction process to optimize energy performance.

Current responsibilities include sustainable building energy services, including fundamental and enhanced commissioning, functional performance testing, and building envelope testing.

Corey Keen, CPMP, CxA, EIT, LEED AP BD+C

NWA Regional Office/Project Manager

Corey holds a degree in Civil Engineering from the University of Arkansas and is an engineer in training in the state of Arkansas.  Through his experience he has expertise in construction project management, facilities and maintenance management, and contract management. He is a LEED Accredited Professional in Building Design and Construction, IECC Commercial Energy Inspector with ASHRAE 90.1-2012, and IECC Commercial Energy Plans Examiner with ASHRAE 90.1-2012, Commissioning Process Management Professional (CPMP), and Certified Commissioning Authority (CxA).

Corey served in the United States Navy Civil Engineer Corps improving the built environment of military installations.  He has worked on a wide range of project types to meet recurring needs of the government, from large military construction projects, major renovations of military housing, to warf and pier repairs.  Through this opportunity, he has multiple years of experience as a project manager responsible for large multi-disciplinary projects from inception to closeout.  Corey also has a broad working knowledge of purchasing regulations and procedures in commercial and government.

Current professional memberships include U.S. Green Building Council Western Arkansas Chapter, Military Officers Association of America NW Arkansas Chapter, and American Society of Heating Refrigeration and Air Conditioning Engineers.

Current responsibilities include sustainable building energy services including fundamental and enhanced commissioning, functional performance testing and LEED sustainable construction consulting in the NWA Regional Office.

Sebastian Graba, CxTLEED Green Associate

Energy Services/Project Coordinator

In 2014, Sebastian will complete his degree in Business Administration at the University of Siegen, Germany. His background also gives him experience in the field of electrical engineering, which he studied for 8 semesters at the University of Stuttgart, Germany. Sebastian is a Certified Commissioning Technician and a LEED Green Associate.

Sebastian recently moved to Little Rock from Germany. He completed an internship with Viridian and now serves as a Project Coordinator for Energy Services. Viridian is his first experience in the sustainability industry and his first job experience in the United States.

Current responsibilities include coordinating projects regarding commissioning activities and scheduling on-site meetings. In addition, he is the connection between LEED and Commissioning in the Viridian office and is also a point of contact for clients.

Angela Wisely, MPA, LEED AP BD+C

NWA Regional Office/Project Manager

Angela holds a B.A. in History from the University of Southern Mississippi and a Master of Public Administration with a concentration in International Sustainable Development from Indiana University’s School of Public and Environmental Affairs. Angela is a LEED Accredited Professional in Building Design and Construction and has over six years of experience in the fields of environmental policy advocacy, education, emergency response, data quality assurance and quality control services, and project management.

Angela co-chairs the U.S. Green Building Council – Arkansas Chapter’s West Branch. She also serves as a facilitator for the Fayetteville Forward Green Economy Group and a member of the City of Fayetteville’s Environmental Action Committee. She chaired the U.S. Green Building Council – Arkansas Chapter’s Sustainable Arkansas sub-committee in 2013 and has served on the state board.

Current responsibilities include providing sustainable design and construction assistance to owners, architects, engineers, and contractors in the NWA Regional Office and help enhance their ability to budget, plan, design, and finance a facility that respects occupant needs, financial responsibilities, and the environment.

Parker Higgs, CEM, LEED Green Associate

Energy Services/Project Manager

Parker attended the University of Arkansas in Fayetteville where he earned a degree in Mechanical Engineering with Minors in both Math and German. Parker is a Certified Energy Manager, LEED Green Associate and a member of the Arkansas Chapter of the U.S. Green Building Council.

Prior to joining Viridian as a Project Manager, Parker served as a Project Engineer and Operations Supervisor at a manufacturing plant in Fayetteville, Arkansas. He began his career there working on a wide range of capital engineering projects including facility construction, refrigeration and equipment design. Later on, he added the responsibility of directly managing 3 production lines consisting of 35 employees.

Current responsibilities include supporting the Viridian team on completing building commissioning tasks, energy modeling, and LEED documentation requirements.

Jeff English, LEED Green Associate

Construction Draw Specialist/Sustainability Project Manager

Before joining Viridian, Jeff served as an Assistant Project Manager for Alessi Keyes Construction, a Little Rock based construction firm. During his time there, he worked on a wide range of project types including medical, general re-model, and retail projects.

Jeff has several years of experience working on construction projects where he was responsible for the coordination between professionals from multiple aspects of the industry. As a Construction Inspector for the Little Rock Air Force Base and in his later position at Alessi Keyes, Jeff was responsible for maintaining quality control of several different projects at once. He coordinated submittals and processed pay requests and is experienced in writing and executing construction contracts.

Jeff  is an active  member of the U.S. Green Building Council Arkansas Chapter Emerging Professionals and a graduate of the University of Arkansas at Little Rock Construction Management program.

Current responsibilities include providing sustainable design and construction assistance to owners, architects, engineers, and contractors to enhance their ability to budget, plan, design, and finance a facility that respects occupant needs, financial  responsibilities, and the environment. Jeff is primarily responsible for LEED Volume projects, Construction Draw Inspections, and conducting Capital Needs Assessments.

Meredith Hendricks, LEED AP BD+C & Homes, NCARB

NWA Regional Office/Project Manager

Meredith is a graduate of the University of Arkansas in Fayetteville where she earned a degree in Architecture. She is NCARB Certified, a LEED Accredited Professional in Building Design and Construction and Homes, and a member of the Arkansas Chapter of the U.S. Green Building Council.

Prior to joining Viridian as a Project Manager, Meredith served as a Project Architect for a firm in the Pacific Northwest. During her time in Portland she worked on a wide variety of projects ranging from a Biodynamic Winery to a new 6 mile long Light Rail alignment in the core of the Portland Metro area. The majority of her work focused on Transit related projects including creating sustainable healthy work environments for the transit maintenance employees.

Due to the nature of large transit projects, Meredith gained experience with public and private clients and multi-disciplinary contracts where she coordinated with architects, engineers, planners, landscape architects, contractors, developers and government agencies. She was responsible for the coordination of the construction documents and during construction managed the submittal reviews, RFI’s, change orders and other field changes related to those projects.

Current  responsibilities include acting as part of the integrated design and construction team and providing assistance to the team to help implement the best possible solution for healthy efficient buildings while also meeting and tracking the requirements of the chosen rating system.

Robby Hill, EIT, LEED Green AssociateRobby

Energy Services/Energy Engineer

Robby graduated from the University of Arkansas at Fayetteville in 2007 with a degree in Mechanical Engineering. After graduating he worked for two years as a pump engineer for an oil services company. During this time he provided engineering support for the manufacturing shop by inspecting parts, conducting pump tests, and analyzing hydraulic pump stages.

In 2010 he returned to the University of Arkansas to further his education and in 2013 earned a Master’s degree in Mechanical Engineering, where he researched building energy modeling, as well as assisting in industrial energy audits with the Arkansas Industrial Energy Clearinghouse. During his course of study he also served as a Teaching Assistant for the University’s Freshmen Engineering Program, as well as completing several internships at several manufacturing plants.

Current responsibilities as Energy Engineer include energy modeling, energy assessments, LEED documentation requirements and providing engineering support for the project team.