Our Staff

Hans Voight, Senior Fisheries Biologist

Mr. Voight has been a professional fisheries biologist for over 17 years representing Tribal and private entities within northern California.  Mr. Voight earned his undergraduate degree from, and completed master’s level coursework at Humboldt State University, in Arcata, CA.  He is well-versed in the ecology of Pacific salmonids, as well as in the multitude of environmental issues facing these fish populations in freshwater and estuarine habitats in California and the Pacific Northwest.  Mr. Voight possesses “hands-on” familiarity with most freshwater fisheries field sampling techniques, having supervised and/or participated in many different studies located in Northern California watersheds.  As both a senior level Tribal biologist, and as a private consultant, Mr. Voight has written numerous environmental and biological documents, notably, ten Biological Assessments (E.S.A. section 7 consultations), and a comprehensive anadromous fish restoration plan for the lower Smith River, CA.  He has also presented scientific findings to, and organized public meetings for both small and large groups from diverse backgrounds. Mr. Voight has led multiple field studies investigating freshwater/estuarine salmonid ecology and biology (fry emergence, rearing, emigration, through adult spawning/migration), assessed habitat requirements for each species and life phase utilizing fresh water, assessed Klamath tributaries upstream of Iron Gate dam for steelhead re-introduction suitability, implemented adult and juvenile salmonid telemetry projects, conducted genetic studies of steelhead hybridizing with coastal cutthroat, and reviewed fisheries restoration grant proposals for four years as a member on the Citizens Peer Review Committee for CDFW’s FRG program.

Mr. Windsor is an avian ecologist with 13 years of experience in avian field studies. He completed his B.S. degree in wildlife biology at Missouri State University and has recently completed his graduate studies at Humboldt State University in wildlife management and will obtain his degree in May 2020. His master’s thesis work focused on Western snowy plover survival and population growth in coastal northern California. He worked as biological science technician, research assistant, and lead field biologist for several non-profit groups, academic institutions, and federal agencies conducting research and field data collection. He has worked with various species and avian taxa including Passerines, Greater sage-grouse, waterfowl, shorebirds, Western snowy plovers, spotted owls, Newell’s shearwaters, Hawaiian petrels, common murres, and other seabirds. He worked as a teaching assistant in Ornithology during his graduate studies and has assisted in wildlife recovery operations at the Refugio oil spill in Santa Barbara, California working with the Oiled Wildlife Care Network of California Department of Fish and Wildlife.

Dr. Isidro Bosch, Associate Scientist

Dr. Bosch is a marine invertebrate biologist and Lake Ecologist with considerable experience working in the marine environment as well as lakes and streams and SCUBA diving in Antarctica, California, the Caribbean and the Mediterranean.  He has published 25 papers in peer-reviewed journals and completed more than a dozen technical reports on various aspects of lake ecology and watershed management.  At SUNY Geneseo, Dr. Bosch teaches courses in Invertebrate Zoology, Marine and Freshwater Community/Ecosystem Ecology, Principles of Ecology, General Biology and more. He has received various awards for teaching, mentoring and research and obtained competitive grants from the NSF to study the effects of ozone depletion on marine invertebrate larvae in Antarctica and from the USDA and other funding agencies to study the effects of watershed management on growth of algae, macrophytes and cyanobacteria in temperate lakes.  His current research is on the cyanobacteria microbiome that occurs in association with sea star larvae in the open ocean, and on the effects of partial mixing of the lake water column in triggering the onset of cyanobacterial blooms in shallow lakes.

Dr. Isidro Bosch obtained his Bachelor’s degree in Aquatic Biology from the University of California at Santa Barbara in 1981 and his Ph.D. in Biology from U.C. Santa Cruz in 1989.  In 1992 Dr. Bosch joined the biology faculty at the State University of New York College at Geneseo, where he is currently a full Professor.

Our Vision

Our Strength

Joshua Cahill

Our commitment to excellent service: we will team with you throughout each project to ensure the best, most cost-effective, and timely results possible.

Joshua Cahill, Fisheries Biologist

Mr. Cahill is beginning his career in fisheries biology with Thomas Gast and Associates Environmental Consultants after working in the aquaculture industry for two years. He was presented the Michael G. Scott outstanding graduating senior in fisheries biology award when he earned a Bachelor of Science degree in fisheries biology from Humboldt State University in 2018. As an undergraduate student, Mr. Cahill wrote a grant proposal to fund his research project, assisted in various projects in both school and the workplace, and published an article about sustainability of the marine aquarium trade. While his undergraduate career focused on aquaculture, Mr. Cahill possesses knowledge and skill of in-hand capture and basic fisheries techniques. Mr. Cahill is currently pursuing a Master of Science degree in fisheries biology at Humboldt State University, studying restoration of coho salmon habitat on agricultural wetlands.

Our Goal

Our goal is to provide innovative, science-based solutions for complex environmental issues. 

Deliver science-based, economical, and on-time environmental consulting solutions for every client.

Brian Murphy, GIS Analyst

Mr. Murphy received his B.S. degree in Environmental Science and Management with an emphasis in Geospatial Analysis in 2019 from Humboldt State University. He uses his skill set of coding, GIS, and design to produce maps, websites, and graphics that can encourage community awareness of environmental issues. He has won multiple cartographic awards for his geographic data visualizations, most notably the 2018 NACIS (North American Cartographic Information Society) conference award for best student research poster for his poster about mountain top removal coal mining. He also was the winner of the 2019 CGS (California Geographic Society) conference second place digital map award for his interactive website mapping California’s watersheds. In addition to his cartographic work, Mr. Murphy has an extensive background in GIS with a focus on remote sensing, and modeling both natural phenomena and human infrastructure. He has published several scientific research papers, including an analysis of dune movement on the north spit of the Humboldt Bay, and modeling of erosion and heavy metal pollution in watersheds that have been subject to strip mining. Mr. Murphy has presented his work at multiple academic conferences across the United States. 

Thomas Gast, Principal Scientist

Mr. Gast formed Thomas Gast & Associates Environmental Consultants (TGAEC) after working for four years at Normandeau Associates as a Senior Scientist and 14 years at Thomas R. Payne and Associates.  Mr. Gast received a B.A. in Marine Resource Management from the University of California at Santa Cruz in 1988 and has worked on and led numerous freshwater fisheries and marine biology field crews in rigorous environments such as Antarctica, the Bering Sea, Yukon Territory, the High Sierras, and Sacramento San Joaquin Delta over the last 27 years.  Mr. Gast is particularly adept at implementing complex studies that require intricate logistics to provide innovative solutions.  Mr. Gast has had training in IFIM implementation; PHABSIM, SEFA, and RHABSIM analysis, and has been involved with all aspects of instream flow studies including study design, stakeholder meetings, field data collection, data analysis, interpretation, report writing, time series analysis, impact analysis, and results presentation.  Mr. Gast has worked extensively with the Acoustic Doppler Current Profiler (ADCP) collecting flow measurements and PHABSIM data, as well as developing several methods of deployments in challenging habitat types including shallow turbulent transects.  Mr. Gast has collected ADCP data for numerous instream flow projects and has traveled to the eastern U.S and northern Canada with the ADCP.  Mr. Gast is a licensed captain through the USCG, utilizing that capacity to implement instream flow, fish tracking, and monitoring studies on both large and small rivers.  Mr. Gast has also implemented fisheries and water quality monitoring studies utilizing multiple detection techniques such as direct observation, electrofishing, netting, and trapping as well as installing and maintaining data loggers and transmitters.

Edward Davis, Hydrologist

Mr. Davis completed his B.S. degree in Geology with a Minor in Watershed Management at Humboldt State University in 2019. During the final year of his studies, he took part in an interdisciplinary and cross-cultural project focused on the water resources and ecohydrology of a unique grassland watershed in the Peruvian Andes. As part of this work, he developed a broad range of skills, including conceptual and numerical hydrological modeling, collecting and processing remote sensing data, and designing, conducting, and analyzing geophysical surveys. The project culminated in a month-long field excursion to Peru, where his expertise was put to the test at an elevation of 14,000 feet. In addition to his experience in Peru, he has also taken part in over 120 geomorphic stream surveys across Northern California over two summer seasons with the HSU River Institute. His primary scientific interests are in hydrology and geomorphology at both reach- and catchment-scale, and he is proficient in both data analysis and fieldwork.

Hire Us

Whether you are a private landowner, utility, municipality, state or federal agency, developer, non-profit, engineering firm, or another consulting group; we will identify the best solutions for your environment issues.