The Wireless Voice -- a silent move about audio communication -- was John McCarthy's entry into the motion picture world. He later became a director, working on features until the mid-1940s.
Popular Electricity and Modern Mechanics, November, 1914, page 510:


    To Director Fred A. Kelsey of the Reliance-Mutual forces goes the honor of introducing wireless telephony in an absorbing photoplay entitled "The Wireless Voice." In producing this picture the wireless telephone station as well as the apparatus of J. P. McCarthy--a well-known radio telephone experimenter--was employed. Not only did McCarthy instruct Director Kelsey and the actors in the use of the apparatus, but he also played an important role in the production. The leading man in this photoplay was Jack Conway and the leading lady, Miss Irene Hunt.
Publictiy shots from 'The Wireless Voice'