What is Dennis DeYoung's net worth? Dennis DeYoung's net worth is $20 million dollars. Born in Chicago, Illinois, Dennis DeYoung began singing as the frontman for a trio he formed with two of his friends when they were all 13 and 14 year olds in the early 60s. The group later added two more band members, and named themselves, Tradewinds. Tradewinds later became TW4, and then settled on the name Styx in 1970. All of the band members worked various jobs while attempting to achieve rock stardom. Dennis DeYoung was an elementary school teacher, but by the mid-70s, the group had shot to stardom. Throughout the late 70s and early 80s, they recorded and released a steady string of hit songs, most penned and sung by Dennis DeYoung. The group went on hiatus in 1984, and has reunited multiple times since then, though often with one member or another replaced due to health complications. Since 1999, he has focused on a successful solo career, and tours frequently.