Frank Michael Sullivan III (born 1 February 1955) is an American musician, singer and songwriter. Best known for being a founding member of the band Survivor, he has been the only permanent fixture in its lineup since the band's 1977 inception.Along with former bandmate, keyboardist and vocalist Jim Peterik, Sullivan co-wrote all of the group's hits, including "Eye of the Tiger" and "Burning Heart" from the Rocky III and IV movie soundtracks.According to pianist and keyboardist Jimmy Tranchitella of Northlake, Illinois, Sullivan's musical career began in his early teens. As he sat in on local garage-band practices and assisted with equipment changes, band members began to observe his serious interest, eventually allowing him to play guitar after practice.