Roy Bartholomew Sonora is the Director of Engineering for On Guard Security Systems Inc., in Modesto, Ca. Born and raised in the San Francisco Bay Area, Mr. Bartholomew is the youngest of 7 siblings who were born to French-speaking, Cajun parents. Roy is also the proprietor of By Referral Only Electric, and after 35 years in the engineering industry, he has acquired a select and in-demand skill set along with favorable partnerships with local and national business owners.