William Desy, a high-caliber firearms instructor, fraud examiner, private investigator, and security consultant, has a wealth of experience when it comes to armed and unarmed defensive tactics among others. Having been certified in firearms instruction and law enforcement handgun and shotgun instruction, Desy is currently an approved CCW firearms instructor for the San Diego Sheriff's Department and the Ventura County Sheriff's Department. He is also a certified self-defense instructor with extensive training in various defensive methods, as well as a state-licensed private investigator and a security consultant.

Desy received his certification in CFE, CFS, Investigator at San Diego State University and studied at Monte Vista High School. In addition to his expertise in firearms and self-defense, he has also worked with the United States Navy's Force Protection Program, Armed Sentry Course, providing small arms instruction with four different weapons systems; M9, Mossberg 590, M16, and M14.

As the owner and lead instructor of CCW USA Firearms Training, Desy currently offers customized training in armed and unarmed defensive tactics and personal protection strategies to cater to one's individual, family, or corporate needs. Previously, he worked as a private investigator and a certified fraud examiner at William Desy, Investigative Consultant, and a loss prevention consultant at Goodwill Industries of San Diego County.