Mr. Clark is responsible for technical and administrative oversight of geological, geotechnical, and civil design and construction projects for the energy, transportation, site development, building construction, water resources, mining, and solid waste disposal industries. He graduated from West Virginia University with degrees in Civil Engineering and Geology. He has more than 25 years of experience as a Geotechnical Engineer responsible for geotechnical and environmental investigations and design services. His projects typically include geotechnical and environmental site reconnaissance and assessment; geologic mapping; layout and implementation of subsurface investigations; air photo interpretation; hydrogeologic analysis; soil and water sampling; selection and evaluation of laboratory testing; remedial and ground improvement design; slope stability analysis; retaining wall design; mine subsidence evaluation, foundation design; and preparation of reports, construction plans, technical specifications, and cost estimates. Mr. Clark has specialized experience in slope stability analysis, reinforced soil and retaining wall design, coal refuse and flyash impoundments, and geotechnical engineering professional practices.

Mr. Donald Groesser is a professional land surveyor with more than 37 years of experience in all phases of land surveying operations, including research, fieldwork, construction control and staking, boundary analysis, legal descriptions and completion of final plats and documents for ALTA/ACSM Land Title Surveys, boundary surveys, topographic surveys, route surveys, pipeline surveys, aerial control surveys, preparation of various statutory plats and other conveyance documents.  He has held positions from entry-level rod man, instrument technician, survey technician, project manager, department manager and small business owner.

Mr. Gullone has civil engineering and site development experience, with his focus being in renewable energy and has managed several solar projects within the state of Pennsylvania. He has manage several large, multi-disciplinary projects and has work experience in Pennsylvania, Ohio, West Virginia, Illinois, Wisconsin, and Indiana. Mr. Gullone serves as the point of contact, team leader, and quality reviewer.

Mr. Slack is a Principal responsible for researching, developing, and implementing cost-effective field investigations and project coordination involving threatened and endangered species effects analyses and surveys, wetland delineations, stream habitat assessments, Endangered Species Act, National Environmental Policy Act, and Clean Water Act permitting.  His daily responsibilities include managing large projects and staff, writing and editing project reports, designing study plans using the most current scientific methods, and qualitative/quantitative interpretation of project data.  Prior to joining CEC in 2010, Mr. Slack spent 16 years with other firms in the private environmental consulting arena, supervising field investigations for large and small research projects.