Todd is a graduate in Ocean Engineering from Florida Atlantic University in Boca Raton. He went on to earn an MBA from Nova Southeastern University & a Professional Engineering certification from the State of Florida.

Todd has well over 30 years of experience in the marine and environmental consulting profession. He and other members of the firm excel in contemporary working knowledge of Federal, State, and Local permitting regulations and requirements. In addition to Todd’s experience in Florida, he has been involved in many marine engineering and environmental projects in the Caribbean, focusing primarily on the Bahamas.

Tim has a post-graduate degree in Wildlife and Wetlands Ecology from the University of Florida and is Vice President of Turrell, Hall & Associates, Inc.  Tim worked in Alaska, Central America, and Africa conducting wildlife and vegetation surveys prior to joining the Turrell team. As the Senior Ecologist for the firm, Tim oversees the environmental division, managing large projects and is very active in wetlands jurisdiction and protected species issues while maintaining regular contact with state and federal environmental managers.

Jeff earned his Bachelor of Science Degree in Environmental Science from Rollins College in 2005. As a Biologist with Turrell, Hall & Associates, Inc. Jeff has been involved with single-family dock and marina permitting, threatened and endangered species surveys, submerged resource surveys, vegetative mapping and classification, jurisdictional wetland determinations, preserve management and monitoring, environmental resource permitting and coordinating with various agency staff on company projects. Jeff specializes in assisting single-family clients with local boat dock extension permitting, variances for setbacks, variances for boat roofs, and state and federal environmental resource permitting.

Jake is a Professional Engineer for Turrell, Hall & Associates, Inc. He obtained his Bachelor of Science Degree in Ocean Engineering at Florida Atlantic University in 2020. Jake works closely with State, Federal, and local government agencies to obtain approvals for a number of marinas and marine-related projects. His responsibilities with the firm include submerged and benthic resource analyses, waterfront development, and design assistance, marine species surveys, obtaining preliminary water depths with HYPACK System for project planning purposes, environmental resource permitting, marine construction management oversight, marine construction plan preparation, and marine construction bid preparation.

Liza works primarily with the engineering and finance teams to implement operational strategies to deliver improved practices geared towards the outperformance of projected budgets and deadlines for large-scale marine projects. Her focus at the firm is leading the Request For Proposal (RFP) processes, budget forecasting, contract document control, cost estimations and review of payment applications and change orders. With her previous work on various land development projects and her time spent at a hedge fund company to that of a national non-profit organization, she adds a unique skill set to the THA team. Liza earned her Bachelor of Arts in Psychology from Stonehill, a private Roman Catholic college in Easton, Massachusetts and holds professional certifications in Finance and Business Management. In her spare time, Liza enjoys playing with her boisterous Boston Terriers and traveling to international foodie destinations.

Marielle obtained her Bachelor of Environmental Science from Alabama A&M University and has been an Environmental Specialist for the firm since 1997 and Operations Manager since 2007. She is typically involved in wetland assessments, mitigation monitoring, wildlife surveys, compliance oversight for permits, sovereign submerged lands issues, habitat restoration, and management plans, creating Spill Prevention Control and Countermeasure Plans (SPCCPs), Fire Prevention and Contingency Plans, Hurricane Preparedness Plans for marine facilities, and Environmental Management Plans (EMPs) for Bahamian projects.

Marielle particularly specializes in post-permit compliance, helping to guide clients through the time-sensitive special conditions which must be met after permit issuance and the drafting of various management plans required to meet those conditions.

Arielle earned two Bachelor of Arts Degrees in Environmental Studies and Biology from Florida Gulf Coast University. She spent 9 years with the Florida Department of Environmental Protection, primarily with the Submerged Lands and Environmental Resource Coordination Program doing wetland and surface water permitting and compliance, wetland determinations, and handling the processing of Sovereign Submerged Lands Leases. She brings that knowledge and experience to Turrell, Hall & Associates, Inc. to coordinate with local, state and federal agencies on projects including jurisdictional wetland determinations, vegetative mapping and classification, threatened and endangered species surveys, preserve management and monitoring, single-family dock and marina permitting, and submerged resource surveys.

Christina graduated from Florida Gulf Coast University 2020 with her Bachelor of Arts in Environmental Studies with a concentration in Water Resources Science and Management. As a staff biologist, Christina assists with jurisdictional wetland determinations, vegetative mapping and classification, threatened and endangered species surveys, preserve management and monitoring, and submerged resource surveys.

Sara graduated from Florida Gulf Coast University in 2025 with her Bachelor of Arts in Environmental Studies with a concentration in Ecology and Environmental Assessment. As a staff biologist, Sara assists with jurisdictional wetland determinations, vegetative mapping and classification, threatened and endangered species surveys, and preserve management and monitoring.

Amanda joined Turrell, Hall & Associates in 2007 as Executive Assistant to Todd Turrell. Over the years, she has played a pivotal role in streamlining processes that enhance the team's efficiency. Currently serving as Office Manager, Amanda fosters an organized and productive environment that supports the firm’s success.

In addition to her administrative expertise, Amanda collaborated closely with Todd on the design and publication of three notable books: Naples Waterfront – Changes in Time (2009), A History of the Bahamas Through Maps (2015), and The Florida Keys – A History Through Maps (2020), as well as over 100 nautical maps with Island Map Publishing.

A seventh-generation native of Collier County, Amanda has a deep passion for local history, particularly the preservation of stories from Naples' "old-timers" for future generations. She is a graduate of Lee County Technical Center and Edison State College.

Randi is a Graphics Specialist with over 15 years of experience as an AutoCAD and G.I.S. design professional.  She works directly with the biologists and engineers to develop marine permitting and construction plan sets.  As a G.I.S. expert, she also evaluates and creates data for a multitude of environmental and marine projects.  Randi was educated at Edison Community College and Florida State College, and holds certificates in multiple graphic art fields.

Originally a native of Illinois, Caitlin has been in SWFL for 3 years. As a project coordinator, Caitlin handles multiple levels of marine and environmental projects, including organizing proposals, communicating with clients and sub contractors, submitting applications and assembling technical reports. She also assists with construction management, helping marine experts in the field as they assess an active construction site. In her free time, Caitlin enjoys paddle boarding, fishing and going to the beach.

Frank’s career spans over four decades in the recreational boating industry in Florida, New York, and the Bahamas. His career in the marine industry includes personal recreational boating and the ownership of multiple marine oriented businesses such as marine consulting, marina management, marine surveying, and yacht repair services. He brings seasoned experience and practical solutions to marina, boat yard, and dry storage design and operations. Frank’s involvement in the industry includes the Marine Industries Association of Florida, Society of Accredited Marine Surveyors, American Boat & Yacht Council, and the American Boat Builders & Repairers Association.

Mark LaFon is a Professional Engineer and Certified General Contractor providing in-house consulting at Turrell, Hall & Associates, Inc. Mark has served in various management roles over the course of his career, including Vice President and General Manager of marine construction companies, and has worked on projects for federal, state and local governments, such as the United States Army Corps of Engineers, Florida Department of Transportation and Tampa Port Authority. With his extensive management experience in construction, engineering, and manufacturing, he has earned a reputation of meeting time and budget objectives. Mark’s valuable ability to identify opportunities has enhanced project revenue and reduced costs through effective use of available resources. Mark has demonstrated strong communication, team building, interpersonal and analytical skills coupled with accomplishments in the areas of professional engineering, design-build, estimating, project management/administration, manufacturing, logistics, local/state/federal regulations, and risk management.

Rocky has over 30 years of experience in the various aspects of construction and permitting with marine and environmentally sensitive projects. He is a graduate of Louisiana Tech University with a Bachelor of Science degree in Geology. Rocky assists with hydrographic surveys, marine structure design and coordinates construction related activities for the firm. Prior to joining Turrell, Hall & Associates, Rocky was president of a large marine construction company for 22 years and was also the owner of a marine lumber supply company.