Board of Directors

KC Hosler, P.Eng
President

KC is Business Unit Manager for the PR Aqua division of Pentair Aquatic Ecosystems.  He has more than 17 years’ experience in the field of aquaculture systems engineering and construction.  He has been project manager and/or lead consultant on an extensive list of projects in aquatic laboratory, fisheries enhancement, and commercial aquaculture applications.  KC specializes in aquaculture facility bio-programming, planning and concept design with special emphasis on the application of advanced water reuse and recirculation technologies.  KC frequently speaks or participates in technical discussion panels at aquaculture conferences and courses, providing him the opportunity to educate regarding modern aquaculture techniques and to share his extensive project experience. KC is a Professional Engineers in British Columbia, Canada and has previously served on the board of the Aquaculture Engineering Society.

Kc Hosler P>Eng

Astrid Buran Holan, Ph.D.
First Vice President

Dr. Astrid Buran Holan is a research scientist in the field of controlled environment aquaculture in Nofima, Norway. Her focus is on the technological aspects of this field, and she will contribute to the further development of the Centre for Recirculation in Aquaculture (NCRA) at Sunndalsøra.

She completed her doctoral degree at the Norwegian University of Science and Technology (NTNU), affiliated with NTNU Sealab and the Department of Hydraulic and Environmental Engineering. She was later employed there as a researcher. Her research in Nofima and NCRA focus on developing and integrating new or already existing water treatment technology in recirculating and semi-closed aquaculture systems, with a simultaneous focus on the needs and requirements of the fish in such systems, as well as the environmental aspect. Dr. Holan is formally affiliated with the Department of Production Biology in Nofima.

Astrid Buran Holan, Ph.D.

Tim Pfeiffer, Ph.D.
Secretary/Treasurer

Dr. Pfeiffer obtained his doctorate degree from Louisiana State University in Engineering Science from the Department of Biological and Agricultural Engineering. Dr. Pfeiffer worked for the USDA as an Agricultural Engineer specializing in aquaculture engineering for over 13 years with a majority of his time spent at the Harbor Branch Oceanographic Institute in Fort Pierce, FL. While with USDA he specialized in design and research of recirculating aquaculture systems, effluent management, and energy and water conservation for RAS designs. Project funding for the USDA research was terminated in 2011 and Dr. Pfeiffer then worked with the Foreign Agricultural Service branch of USDA as an Agricultural Advisor in Afghanistan. He was stationed in Afghanistan for over a year and his main focus was water resource development and conservation. Upon his return in 2013 he began working for Aquaculture System Technology. He is the Research Director for the Engineering department at AST and also assists in system design for the initial phases of a project. Dr. Pfeiffer has been a long-time member of AES (18 yrs) and has served as its Secretary/Treasurer from 2006 until 2012. He currently serves on the editorial board of the Aquaculture Engineering journal.

Todd C. Guerdat, Ph.D.
Past President

Dr. Todd Guerdat is a professor of Agricultural Engineering at the University of New Hampshire with appointments in both the Biological Sciences and Civil and Environmental Engineering departments. Dr. Guerdat earned his PhD in Biological and Agricultural Engineering from North Carolina State University researching water and wastewater treatment in recirculating aquaculture systems at the pilot and large scales. Todd has served as the Director of Research and Development for Aquaculture Systems Technologies in New Orleans, LA and as the Director of Nutrient Management Systems at Cambrian Innovation. His agricultural engineering research program at UNH is centered on scalable nutrient capture and reuse systems, protected agricultural systems, and alternative agricultural energy systems which will provide opportunities for students and farmers alike to apply their knowledge in a practical manner. He is currently working toward optimizing the integration of recirculating aquaculture systems with plant production for improved nutrient utilization while preserving economic sustainability.

Todd Guerdat, Ph. D.

John Davidson
Director (USA)

John Davidson is as a Senior Research Associate at the Conservation Fund’s Freshwater Institute in West Virginia, where he has worked for 15 years. He earned a M.S. in Wildlife and Fisheries Resources from West Virginia University and a B.S. in Biology from Shepherd College. He has conducted a wide range of aquaculture research projects encompassing topics such as: evaluation of RAS unit process efficiencies, assessment of the effects of various water quality parameters on salmonid performance within RAS; and evaluation of alternative protein diets on water quality and fish performance within RAS. John manages and operates recirculating aquaculture systems and provides practical consulting support for the Engineering Services team at the Conservation Fund's Freshwater Institute. John is the author of 16 peer-reviewed articles, many of which have appeared in Aquacultural Engineering journals.

Andrew Ray, Ph.D
Director (USA)

Dr. Andrew Ray is an Assistant Professor of Aquaculture Production in the Division of Aquaculture at Kentucky State University.  He holds a Ph.D. from the University of Southern Mississippi, a M.S. degree from the University of Charleston, South Carolina, and a B.S. degree from the University of Central Missouri.  His research has focused on the development of sustainable aquaculture systems and practices.  Much of his work has dealt with biofloc-based aquaculture in which a dense microbial community in the water column cycles waste products and provides supplemental nutrition to animals.  He has examined the effects of particulate organic loading, microbial ecology and management, water quality, nutrient cycling, stable isotope dynamics, artificial seawater development, waste remediation techniques, and the use of fish-free diets to culture marine animals.  His research is intended to improve systems, techniques, and technologies that enable the efficient inland production of high-quality aquatic animals.  Andrew has been a member of the AES since 2010 and currently serves as the webpage editor for the Biofloc section of the AES website.  He has chaired or co-chaired four sessions at aquaculture conferences, and won several awards including the Distinguished Early Career in US Aquaculture Award from the US Aquaculture Society. 

Andrew Ray, Ph.D

Karin Isabel Suhr, Ph.D
Director (Denmark)

Currently working at the National Institute of Aquatic Resources at the Technical University of Denmark, Section for Aquaculture, in Hirtshals Denmark. She holds a master’s degree in food science from the Royal Veterinary and Agricultural University of Denmark and a Ph.D. degree in biotechnology/mycology from the Technical University of Denmark in Lyngby.

Research area is effluent waste treatment from recirculating aquaculture systems (RAS), microbial N-transformation processes (nitrification, denitrification) and anaerobic digestion of solid waste.

Karin Isabel Suhr, Ph.D

Mark Schumann
Director (Germany)

Mark Schumann studied biology from 2004 to 2010 with a focus in fish ecology and limnology and holds a diploma degree from the University of Konstanz in Baden-Württemberg, Germany. His research at the Fisheries Research Station of Baden-Württemberg in Langenargen, where he has worked since 2010, is focused on impact of feed composition on aquaculture effluents, which is also topic of his doctoral theses. Further research fields are suspended solids in recirculating aquaculture systems and fish welfare. He is in charge of running and developing the research RAS facilities and leads the aquaculture team.

Mark Schumann

Marius Haegh
Director (Norway)

Marius Haegh is VP Aquaculture for Krüger Kaldnes AS, a subsidiary of Veolia Water Technologies. He earned his M.Sc degree in Environmental engineering from the University of Aalborg, Denmark in 1996. Main focus of operation has been development and integration of the biological MBBR process for purification of waste- and process water. Marius is a water treatment specialist with special emphasis on closed containment aquacultural systems. Experience covers innovation, concept design, process lead and execution of large commercial scale RAS for salmonids including smolt, post-smolt and full size salmon. Experience also covers other species such as turbot, shrimp, perch and more.

Marius Haegh