
OUR TEAM MAKES ALL THE DIFFERENCE IN THE WORLD
Our staff has a wide range of disciplinary expertise along with decades of experience – but we are more than just technical experts. We developed an acronym to illustrate our core values – HEART. We are:
Helpful
Ethical
Appreciative of the opportunity to serve
Responsive
Team Player for our clients
Our ultimate goal is to develop foundational relationships with our clients – to truly understand what matters – and to provide exactly that on each and every project.

President
Ms. Mary Sharrett has over 30 years of engineering and environmental consulting experience and specializes in bringing projects from concept through final construction. She became sole owner of STONE in 2014, managing all aspects of the firm (environmental, engineering, GIS, ecological, and industrial compliance). She is skilled in Project Management for large-scale projects, possessing excellent leadership, organizational, and project management skills. Mary is responsible for managing a team of professionals, allocating staff resources for STONE, and managing a variety of subconsultants and subcontractors. Since taking over the leadership of STONE, the firm has increased in size, revenue, and profitability through clear communication, enhanced collaboration, commitment to quality, and responsive service to clients. In 2018 STONE was awarded ODOT’s DBE Consultant of the Year for the firm’s professionalism, integrity in work standards, and performance.
- Professional Engineer – OH
- Leadership in Energy and Environmental Design (LEED AP)
- Certified Professional Erosion & Sediment Control (CPESC)
- Certified Asbestos Hazard Evaluation Specialist (AHES)
- Certified Asbestos Hazard Project Designer (AHPD)
- USFWS Approved Running Buffalo Clover Surveyor
- OSHA 40-hr HAZWOPER & Supervisor
- BS Civil Engineering, University of Cincinnati
- Permitting and Agency Negotiation
- Turnkey Project Management (Environmental, Environmental, and Construction)
- Environmental Compliance

Engineering Director
Ms. Frances Rourke has more than 29 years of experience in the transportation industry and a deep knowledge of roadway and bridge design and plan preparation. She leads the Engineering Team at STONE, whose capabilities include a multitude of engineering design services with engineers of diverse backgrounds and decades of experience.
- Professional Engineer – OH
- Bachelor of Science, Civil Engineering, The Ohio State University
- Roadway Geometric Design
- Maintenance of Traffic Design
- 3-D Modeling
- Right of Way Plan Preparation
- Project Management

Ecological Services Manager
Mr. Scott Ross has over 22 years of environmental consulting experience and is certified as a Professional Wetland Scientist (PWS) and a Certified Professional in Erosion & Sediment Control (CPESC). As Ecological Services Manager, he leads a team of ecologists and natural resources staff who specialize in natural resource and ecological studies designed to meet the NEPA regulations. This ranges from anti-degradation stream, wetland, and water quality studies to endangered species surveys to cultural resources.
- Professional Wetland Scientist (PWS)
- Certified Professional Erosion & Sediment Control (CPESC)
- Certified Erosion, Sediment, and Stormwater Inspector (CESSWI)
- ODOT Prequalification for Ecological Surveys, Waterway Permits, and Stream and Wetland Mitigation
- ODOT Training Courses for Ecological Surveys, Waterway Permits, NEPA Environmental Documentation (CE and Section 4(f)), and Project Development Process (PDP)
- Ohio EPA Training Courses for Stream and Wetland Habitat Assessments (HHEI, QHEI, and ORAM)
- Numerous training courses for wetland delineation, advanced wetland assessment (VIBI), flora identification, stream and wetland restoration
- BS Life Science, Specializing in Ecology and Environmental Science, Otterbein University
- Jurisdictional Waters Delineations
- Ecological Surveys
- Stream and Wetland Habitat Assessments
- Aquatic Surveys
- Threatened and Endangered Species Surveys
- Stream and Wetland Mitigation
- Waterway Permitting
- NEPA Environmental Documentation (Categorical Exclusions, Section 4(f))
- SWPPP Review
- Stormwater, Erosion and Sediment Control Inspection and Management

Compliance Services Manager
Ms. Samantha Robbins has over nine years of environmental consulting and engineering experience including environmental compliance review and monitoring, waterway permitting, agency coordination, and stormwater inspection and SWPPP review. In her role as Compliance Services Manager she leads a team of environmental compliance staff who assist our clients with all types of compliance, from stormwater inspections and sampling to management of permit conditions for construction or daily operation.
- Certified Erosion, Sediment, and Stormwater Inspector (CESSWI)
- ODOT Training Course Certificates: NEPA – Managing the Environmental and Project Development Process; Environmental Site Assessments; Public Involvement; Ecological Survey Report; Categorical Exclusions 2; Waterway Permits; Section 106, Section 4(f) & 6(f)
- OSHA 10 Hour Construction Safety Certification
- Ohio Local Technical Assistance Program (LTAP): Project Estimating Level 2; and: Excavation Safety
- OEPA Level 1 QDC/HWHP Stream Water Quality Monitoring
- BS Environmental Sciences – The Ohio State University, School of Environment & Natural Resources
- Environmental compliance review and monitoring
- Waterway permitting,
- Agency coordination
- Stormwater inspection
- SWPPP review

Principal Ecologist
Dr. Michael Hoggarth, Professor in the Department of Biology and Earth Science at Otterbein University, is joining the STONE team as Principal Ecologist. He received his B.S. in Biology from Seattle Pacific University, his M.S. in Biology from the University of North Alabama, and his Ph.D. in Zoology from The Ohio State University, where he specialized in freshwater mussel ecology and systematics. He was an Environmental Scientist with the Ohio Department of Transportation, Bureau of Environmental Services from 1987-1992. He has published extensively on the life history, ecology, and systematics of mussels in the family Unionidae, including numerous peer-reviewed papers, and he is co-author of a book entitled, The Freshwater Mussels of Ohio (2009). Since leaving ODOT, he has performed thousands of aquatic assessments and mussel surveys in partnership with many ecological, environmental, and engineering firms across the Midwest. He has been a member of the Ohio Academy of Science since 1980, a Fellow of the Academy since 1999, and was President of the Academy from April, 2014 to April, 2016.
- Federal (USFWS) Permit for Mussel Surveys
- State (ODNR) Permit for Mussel Surveys
- PhD Zoology, The Ohio State University
- MS Biology, University of North Alabama
- BS Biology, Seattle Pacific College, cum laude
- Co-author of The Freshwater Mussels of Ohio (2009) and numerous peer-reviewed papers.
- Mussel surveys & aquatic assessments
- USFWS Biological Assessments
- Macroinvertebrate/fish sampling, identification to species, & analysis
- Professor, Department of Biology and Earth Science at Otterbein University
“STONE has provided industrial environmental compliance auditing on several project sites for Amec Foster Wheeler during the last 18 months. They are very thorough, prompt, and knowledgeable in implementing the work. Sharon and STONE are focused on customer service, which is refreshing.”