Crispin grew up in British Columbia and has done biodiversity inventories in almost every area of BC, Alberta, and the Yukon, from 1974 to the present. He was the Entomology Collection Manager at the Royal BC Museum in Victoria 1987-1993, worked for BC Environment in forestry planning and enforcement 1993-2003, operated his own environmental consulting company 2003-2010, and joined Ecofor as a Senior Biologist in 2011. He is a professional biologist with a comprehensive fisheries and wildlife background in project management, environmental inspection/monitoring, environmental assessment, permitting, and baseline studies. He has worked in private consulting and the provincial government since 1987 and has expertise in highways, mines, forestry, urban, hydroelectric, powerlines, and other development projects. Crispin has a strong regulatory background, starting with his 10 years of experience with BC Environment, and continuing with his environmental consultant experience with a focus on the legal requirements for water, fish, wildlife, and species at risk management. He was an active part of the committee that finalized the Forest Practices Code of BC Act Regulations and the Riparian Management Area Guidebook, and wrote and assisted in implementing Compensation Plans for Fisheries Act Authorizations. He is a world expert on butterflies of Canada, especially species at risk, and has a very large private collection.