Jeff Sikich is a wildlife biologist researching the impacts of urbanization and habitat fragmentation on mountain lions in Southern California. Jeff manages the field work for this study, one of the longest running of its kind, which informs mountain lion conservation, as well as outreach, education, and habitat conservation efforts locally and around the world. Over the last three decades Jeff has captured and handled over 16 carnivore species for wildlife research and he has advised and trained many professionals around the world on humane capture methods. In addition to his work in California, Jeff has contributed to mountain lion research in Montana, Arizona, Mexico, Nicaragua, and Peru. He has worked with gray wolves, black bears, lynx, coyotes, bobcats, desert tortoise, sea lions, and deer, as well as studies focused on tigers in Sumatra, jaguars in North, Central, and South America, and leopards in South Africa. His worked has centered on conservation, including habitat connectivity, corridors, toxicants, and human-wildlife conflict resolution. Jeff has contributed to many scientific papers and popular articles on carnivore ecology and conservation, and his work has been featured on numerous television programs, news outlets, and documentary films.