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Phone        850-222-7535


Address    310 W. College Ave. Tallahassee, FL 32301



Louisiana State University, Baton Rouge, LA          

Master of Science in Civil Engineering (1991)

Bachelor of Science in Civil Engineering (1988)

With a strong background in site and stormwater design, regulatory approvals, and entitlements for the last 24 years, Mark has the necessary expertise and experience to provide valuable strategic direction and technical support to generate solutions to even the most unanticipated complications.

Mark’s background in the private sector as a consulting engineer included representation of private and public clients. Delivering successful permit decisions while navigating a complex and ever-changing regulatory landscape provided him with the perspective needed to effectively represent the interests of clients. His professional practice experience also includes stormwater modeling, FEMA floodplain analysis, roadway design, DRI approval and CCD engineering.

Mark’s leadership at the Florida Department of Environmental Protection provided him with important insight into the policy setting functions of the executive and legislative branches of state government. Serving as a Division Director also afforded him the opportunity to develop close working relationships with the leadership of many state agencies, members and staff in the Florida Legislature, the U.S. Environmental Protection Agency, and the U.S. Army Corps of Engineers.


Florida Professional Engineer #48287
Georgia Professional Engineer #22911
LEED AP BD+C Identification Number 10425712
Florida Certified Sedimentation and Erosion Control Inspector 
Georgia GSWCC Level II Certified Design Professional Number
Florida Engineering Society (1997-present)
FES Board of Directors (2006-2008)
National Society of Professional Engineers (1997-present)


WSource Group, LLC
Vice President  (March 2015 – Present)

•    As the lead stormwater engineer, responsible for technical review of potential projects and identification of operational, design, or technological improvements that can enhance project performance
•    Recognized expert in stormwater design, ERP permitting and computer modeling including ICPR and XP-SWMM
•    Represents clients on a wide range of environmental regulatory issues, including assisting with entitlements, developing permitting strategies for innovative projects, and navigating complex permitting issues in the water and wastewater areas

Littlejohn, Mann & Associates
Associate (March 2015 – Present)

•    Provides strategic guidance, policy recommendations, and technical assistance to clients including the Florida Engineering Society
•    Represents clients before the Florida Legislature and Executive Branch agencies on a wide variety of environmental issues, including water and energy related matters

Florida Department of Environmental Protection
Director, Division of Water Resource Management (May 2011 – March 2015)

•    Director of the Division of Water Resourse Management overseeing regulatory and funding programs with over 300 employees statewide
•    Developed and communicated the Division’s regulatory mission, vision and objectives with the Secretary’s Office, EPA, state and local elected officials, the regulated community, environmental interests, and the general public
•    Solved complex problems – successfully negotiated with EPA and a coalition of Florida’s regulated interests on resumption of ASR permitting in Florida which became the model for the nation
•    Oversaw the Division’s rule-making priorities which included a major revision to the ERP permitting rule, Chapter 62-330, F.A.C.
•    Directed a division re-organization that promoted efficiency by combining like functions, restructuring management structure and reduced layers or management from 7 to 4, developed cost savings for the Division that resulting in savings to the State of over $3 million in FY 12-13 and $4 million in FY 13-14
•    Successfully represented the Department in negotiated settlement for Miami Harbor Dredge project
•    Oversaw funding and contract management for over $1 billion in fixed capital outlay projects 

Genesis Group
Associate Vice President and Director of Stormwater and Site Development Division
(July 2003 – May 2011)

•    Company representative to Public and Private sector clients responsible for representing Genesis’ interests in negotiating contracts and settling contract disputes 
•    Worked with Board to develop company vision, marketing strategies and company policies
•    Represented Private and Public Sector clients, obtaining state Environmental Resource Permits and U.S. Army Corps of Engineers permits
•    Representative projects include Capital Cascade Park, Capital Cascade Trail Master Plan, Gaines Street Reconstruction, Lafayette Street Stormwater Improvements, Lakeview Drive Flood Mitigation, Franklin Boulevard Flood Relief, and FAMU Way Stormwater Design

Kimley-Horn and Associates, Inc.
Practice Builder  (June 2000 – June 2003)

•    Represented commercial retail, commercial office, single family residential, multi-family residential and continuing care facilities
•    As sole stormwater and site development engineer in Tallahassee, represented the company to prospective clients, negotiated contracts, managed staff, represented the company and projects at public meetings, and managed production of work product
•    Representative projects include a 450 acre multi-use development, an 11,000 square foot retail site, 1,200 unit residential development  including Application for Binding Letter on Development of Regional Impact Status, 60-acre residential development, 32-acre commercial site master plan, 100,000 square foot retail center, roadway expansion projects

Moore Bass Consulting, Inc.
Partner  (January 1996 – May 2000)

•    Senior staff engineer reporting directly to company principals.  
•    Responsible for stormwater master planning and commercial and residential development projects from inception to occupancy.
•    Typical project elements included master planning, land use planning, public participation, stormwater master planning, design of collection and treatment systems; identification of site specific zoning issues
•    Provided site civil engineering design including site layout, grading, sediment and erosion controls, tree protection, water distribution, wastewater collection, stormwater conveyance, pavement design, internal circulation, pavement markings, and connection to state and local roads, project bidding, construction management, and post construction certifications

Mark Thomasson
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