In April 1965, programming consultant Bill Drake crafted KHJ's top 40 format. Drake hired program director Ron Jacobs, who had created formats in Hawaii and California. The format, known as "Boss Radio", featured a restricted playlist and restrained commentary by announcers (although a few, such as Robert W. Morgan, Charlie Tuna, Humble Harve Miller, and The Real Don Steele, were allowed to develop on-air personas). Other DJs from this era (1965–1980) included Roger Christian, Gary Mack, Dave Diamond, Beau Weaver, John Leader, Sam Riddle, Johnny Williams, Frank Terry, Johnny Mitchell, Tommy Vance, Scotty Brink, Steve Clark, Bobby Tripp, Tom Maule, and Bill Wade. One defining characteristic of Boss Radio was the jingles by the Johnny Mann Singers. Drake's format spread throughout North America, bringing high ratings to KFRC in San Francisco, WFIL in Philadelphia, KGB in San Diego, WQXI in Atlanta, WRKO in Boston, and CKLW in Windsor, Ontario, Canada (serving Detroit). Drake and his business partner Gene Chenault brought many of their announcers from the other Boss stations, using those stations as a farm system to develop talent.