9 Licensed Professional Geologists — and growing
ASRus's technical team spans 23 hydrogeologists and geologists-in-training firmwide, working under one of the strongest concentrations of PG experience in Florida. Several more staff are on track for their own PG licenses in the next few years.
- 330+Years combined experience
- 86+Years combined at ASRus
- 9Licensed Professional Geologists
- 23Total Geologists (firmwide)
Our Team
Mark B. McNeal, PG
Chief Executive Officer & Founder
FL PG #1231 · B.S. Geological Engineering, Brigham Young University, 1984 · 41 years of experience · founded ASRus in 2006
LinkedInFounded ASRus in 2006 and has led hydrogeologic work on the City of St. Petersburg's injection well program continuously since 1985 — four decades across water supply, ASR, deep injection, and reuse. Past President of WateReuse Florida.
J. Pete Larkin, PG
President
FL PG #2793 · B.A. Natural Science, University of South Florida, 1994 · 27 years of experience, 11 with ASRus
LinkedInMr. Larkin, P.G., is the President of ASRus, LLC and a Licensed Professional Geologist in Florida. He has 27 years of experience in the permitting, design, construction, testing, and operation of Class I and Class V injection wells for municipalities and private industry clients across the state. He is recognized as a…Mr. Larkin, P.G., is the President of ASRus, LLC and a Licensed Professional Geologist in Florida. He has 27 years of experience in the permitting, design, construction, testing, and operation of Class I and Class V injection wells for municipalities and private industry clients across the state. He is recognized as a subject matter expert in Florida's underground injection regulations. Mr. Larkin advocates for responsible, economically viable strategies to protect and manage water resources through underground recharge, storage, and disposal as appropriately dictated by hydrogeologic and water quality conditions.
Jason M. Mills, PG, BCES
Vice President
FL PG #2017 · 34 years of experience · joined ASRus 2026
LinkedInJoined ASRus in 2026 after a career at CDM Smith leading groundwater supply, ASR, managed recharge, and Class I/V injection well programs across Florida, Georgia, Virginia, and North Carolina — including JEA's Surface Water Discharge Elimination Program.
Joseph Haber, PG
Vice President, Lead Modeler
26 years of experience · joined ASRus 2026
LinkedInJoined ASRus in 2026, with prior experience at Stantec in brackish groundwater supply, wellfield master planning, and UIC well construction and water use permitting for the City of Venice, City of Haines, Lakewood Ranch Stewardship District, Town of Dundee, City of Lake Wales, City of Punta Gorda and the PRMRWSA.
Joseph Haberfeld, PG
Senior Hydrogeologist, UIC Permitting Lead
FL PG #232 · M.S. Geology, Southern Illinois University, 1977 · B.S. Geology, SUNY Fredonia, 1975 · 38 years of experience, 5 with ASRus
LinkedInSpent 34 years at FDEP — including as the agency's UIC program manager, evaluating hundreds of Class I, recharge, and ASR permits statewide — before joining ASRus, where he now leads UIC permitting work.
Marty Clasen, PG
Senior Hydrogeologist, Emeritus
FL PG #27 · BS & MS Geology, University of South Florida · 47 years of experience, 15 with ASRus
LinkedInOne of the earliest licensed Professional Geologists in Florida. Started his geology career out West in the mountains, before building out ASRus's core UIC and water-supply project base over decades with the firm — FGUA Lehigh Acres, City of Apopka, and JEA's H2.O and Nassau County programs among them. Transitioned off…One of the earliest licensed Professional Geologists in Florida. Started his geology career out West in the mountains, before building out ASRus's core UIC and water-supply project base over decades with the firm — FGUA Lehigh Acres, City of Apopka, and JEA's H2.O and Nassau County programs among them. Transitioned off active project work in 2024; still splits his time between Florida and the mountains.
Dave Adams, PG
Senior Hydrogeologist
FL PG #1827 · B.S. Geology, University of South Florida · 35 years of experience · joined ASRus 2026
Licensed Professional Geologist in Florida since 1996. Career has included injection well projects, wellfield management, groundwater contamination assessment, Superfund site cleanup, closed landfill investigations, environmentally sensitive land acquisitions (ELAPP), and regulatory liaison work on numerous…Licensed Professional Geologist in Florida since 1996. Career has included injection well projects, wellfield management, groundwater contamination assessment, Superfund site cleanup, closed landfill investigations, environmentally sensitive land acquisitions (ELAPP), and regulatory liaison work on numerous high-profile environmental permitting and enforcement cases. Joined ASRus in 2026 after 35 years in Florida water and environmental management, most recently as Hydrogeology Manager for Pinellas County Utilities (2017–2026) and, before that, 24 years as Hillsborough County's Environmental Manager. Serves on the board of Region 4 of the Florida Section of the American Water Works Association (FSAWWA).
Kelly Probst, PG
Senior Hydrogeologist, Construction Manager
FL PG #2794 · MS Geological Sciences, University of Florida, 2007 · BS Geology, Indiana University, 2004 · 18 years, 3 with ASRus
Leads well construction oversight on UIC projects, including recent injection well expansions at St. Petersburg's Southwest and Northwest Water Reclamation Facilities.
Josh Epting
Senior Hydrogeologist
MS Earth Sciences, University of Memphis, 2008 · BS Environmental Science, Delta State University, 2002 · 24 years of experience, 1 year with ASRus
LinkedInSenior Hydrogeologist with more than 24 years of hydrogeologic, water resources, and geotechnical consulting experience, specializing in the planning, permitting, construction, testing, and regulatory compliance of underground injection control (UIC) and water supply well systems. Extensive experience with Class I and…Senior Hydrogeologist with more than 24 years of hydrogeologic, water resources, and geotechnical consulting experience, specializing in the planning, permitting, construction, testing, and regulatory compliance of underground injection control (UIC) and water supply well systems. Extensive experience with Class I and Class V UIC systems and municipal water supply, including aquifer recharge, aquifer storage and recovery, and exploratory and water supply wells across the Upper and Lower Floridan aquifers. Serves as lead hydrogeologist on Class V exploratory well programs for Naval Station Mayport and JEA's Arlington East WRF.
Hunter Clasen, PhD, PG
Senior Hydrogeologist, Groundwater Modeling
FL PG #3183 · PhD Geology, USF 2018 · MS & BS Earth & Atmospheric Science, Georgia Tech · 12 years, all with ASRus · FAA Part 107 certified drone pilot
LinkedInWorks on groundwater modeling firmwide and serves as field lead on UIC construction, including the City of Largo's Class I injection well program and the W.E. Dunn WRF conversion for Pinellas County.
Taylor Murray
Hydrogeologist
B.S. Geology, Florida State University, 2018 · 10+ years of experience, 3+ with ASRus
LinkedInLeads Northeast Florida efforts involving deep injection well hydrostratigraphic investigations, drilling and testing, permitting, regulatory compliance, and operational testing. Supports UIC projects focused on beneficial groundwater recharge, aquifer replenishment, and protection of groundwater resources in…Leads Northeast Florida efforts involving deep injection well hydrostratigraphic investigations, drilling and testing, permitting, regulatory compliance, and operational testing. Supports UIC projects focused on beneficial groundwater recharge, aquifer replenishment, and protection of groundwater resources in Jacksonville, Florida. Joined ASRus in 2023 with experience in hydrogeologic consulting focused on groundwater resources, aquifer replenishment, water quality and wellfield monitoring, and site remediation in Florida, Arizona, and California.
Eli Prescott
Hydrogeologist
BS Geology, University of Florida, 2022 · 3.75 years, all with ASRus
LinkedInField geologist on UIC and water supply projects including Manatee County's Piney Point injection well and the FGUA Lehigh Acres injection well program.
Jacob Booe
Hydrogeologist
BS Geology, USF, 2022 · 3.5 years, all with ASRus
LinkedInOnsite geologist on injection well and water supply projects, including the Polk Regional Water Cooperative's Southeast Cretaceous well — drilled to 8,022 feet.
Colton Conrad
Hydrogeologist
BS Geology, USF, 2023 · A.A., St. Petersburg College, 2020 · 4.3 years, all with ASRus
Field geologist on injection well projects, assisting with well development, installation, and monitoring, and supporting field activities across geology, hydrogeology, and engineering work.
Ryan Szeezil
Hydrogeologist
Geologist in Training (FL) · BS Environmental Geology, FGCU, 2023 · 4 years of experience, 2.25 with ASRus
LinkedInResident field geologist on Class I and Class V injection well and water supply projects, including the City of Bradenton's aquifer recharge system.
Aliya Simms
Staff Hydrogeologist
B.S. Geology, University of South Florida, 2024 · 2+ years of experience, all with ASRus · sitting the ASBOG Fundamentals of Geology exam October 2026
LinkedInField hydrogeologist on Underground Injection Control (UIC) and municipal supply well projects. Experience in well construction oversight, water quality monitoring, and supporting hydrogeologic analysis. Resident geologist at the Pinellas County W.E. Dunn Class V exploratory well, City of Largo Class I injection well,…Field hydrogeologist on Underground Injection Control (UIC) and municipal supply well projects. Experience in well construction oversight, water quality monitoring, and supporting hydrogeologic analysis. Resident geologist at the Pinellas County W.E. Dunn Class V exploratory well, City of Largo Class I injection well, and MacDill Air Force Base Class I injection well. Assists with operational oversight at the Manatee County Piney Point Class I injection well and regulatory compliance with the St. Petersburg injection well system.
Steven Sawyer
Staff Hydrogeologist
B.S. Environmental Geology, Florida Gulf Coast University, 2026 · 6 months, all with ASRus · sitting the ASBOG Fundamentals of Geology exam October 2026
LinkedInStaff Hydrogeologist on a Class I injection well project in Babcock Ranch, with field oversight during pilot hole drilling, coring, packer testing, well construction, and other site operations. Sitting the ASBOG Fundamentals of Geology exam in October 2026 toward a Geologist in Training (GIT) certification.
Brittney Hawley
Staff Hydrogeologist
B.S. Geology, University of South Florida — expected Fall 2026 · Minor in Environmental Science & Policy · A.A., St. Petersburg College, cum laude
LinkedInBrittney Hawley is a Staff Hydrogeologist at ASRus with a focus on hydrogeology, environmental geology, and water resources, bringing experience in environmental field work, geological research, and laboratory analysis — including work as an undergraduate research assistant supporting geochemical and mineralogical…Brittney Hawley is a Staff Hydrogeologist at ASRus with a focus on hydrogeology, environmental geology, and water resources, bringing experience in environmental field work, geological research, and laboratory analysis — including work as an undergraduate research assistant supporting geochemical and mineralogical studies. She earned her A.A. from St. Petersburg College, graduating cum laude, and is completing her B.S. in Geology with a minor in Environmental Science & Policy at the University of South Florida.