Francis P. Mull Eugene Mullen is an American vocalist, best known as the former frontman for the New York technical death metal band Suffocation. He is one of the first vocalists to introduce low-pitched growling vocals into the death metal genre. He performed and recorded with the band from 1989 to 2018.

Suffocation is an American death metal band formed in 1988 in Centereach, New York, currently consisting of lead guitarist Terrance Hobbs, bassist Derek Boyer, rhythm guitarist Charlie Errigo, drummer Eric Morotti, and vocalist Ricky Myers. The band rose to prominence with their 1991 debut album Effigy of the Forgotten, which became a blueprint for death metal in the 1990s. Since then, Suffocation has recorded eight albums. These feature growled vocals with downtuned guitars, fast and complex guitar riffs and drumming, open chord notes and occasional breakdowns.