Leo Guthart joined ADEMCO in 1963 and then served as Vice Chairman of Pittway Corporation and Chief Executive Officer of its Security Group of Companies until its sale to Honeywell in 2000.
Guthart joined ADEMCO in 1963, which grew to the world's largest manufacturer of security and alarm devices by 1992, under the leadership of Guthart. He then served as Vice Chairman of Pittway Corporation and Chief Executive Officer of its Security Group of Companies, including ADEMCO, until its sale to Honeywell in 2000. 
