Liesl Tiefenthaler is an aquatic biologist specializing in the fate and effect of contaminants in storm water runoff and wetlands. Her current research areas focus on the ecological impacts of hydrologic alteration, particularly in intermittent streams and sea level rise and global climate change impacts in coastal regions. Other research areas focus on studying anthropogenic disturbances influencing the fauna and food web dynamics of estuarine and freshwater systems and hydro-geomorphic classification of streams in California for the California Environmental Flows Framework (CEFF). She also conducts biological assessments of the condition of waterbodies using surveys and other direct measurements of resident biological organisms, macroinvertebrates, fish, and plants to answer the question of whether waterbodies meet their designated aquatic life uses. Other research focuses include developing biotic targets designed to protect stream health and geospatial data visualization and analysis.
She received B.S. in marine biology from California State University, Long Beach in 1991. She joined SCCWRP in July 1994.
B.S., marine biology, California State University, Long Beach, 1991.
Senior Research Technician, Southern California Coastal Water Research Project. Costa Mesa, CA. 2009-present
Scientist, Southern California Coastal Water Research Project. Costa Mesa, CA. 2006-2009
Senior Research Technician, Southern California Coastal Water Research Project. Costa Mesa, CA. 1999-2006
Research Technician, Southern California Coastal Water Research Project. Costa Mesa, CA. 1994-1999
Bioassay Technician, Marine Biological Consultants Applied Environmental Sciences. Costa Mesa, CA. 1992-1993
Marine Biology Camp Director, City of Long Beach Department of Parks and Recreation. Long Beach, CA. 1988-1991
Honors and Awards
Phi Eta Sigma, Alpha Lambda Delta (National Scholastic Honor Society)
Dean's List, California State University, Long Beach
Professional Societies and Certifications
ArcGIS Online and ArcGIS Pro Spatial Analysis and Data Science Certificates (2019-present)
Episodic River CRAM (2018)
California Rapid Assessment Method (CRAM) (2004-2018)
CRAM for Wetlands (2016)
National Society of Environmental Toxicology and Chemistry (Southern California/Southwest Chapter)
Southern California Academy of Sciences
Scuba Diver, Research Scuba Diver
American Red Cross (CPR, Advanced First Aid, Advanced Lifesaving)
Certified Forklift Operator
Range Safety (RSO) Certified at Marine Corp Base Camp Pendleton (2012-2019)