Dennis Hardy "Fergie" Frederiksen was the former lead singer for Toto for their Isolation album. He also fronted major label bands Trillion (featuring future Madonna producer Patrick Leonard) and Leroux. Toto (IPA pronunciation: ) is an American rock/pop/prog band which had their greatest commercial success in the 1980s. ... Patrick Leonard is an American songwriter, keyboardist and music producer, known for his longtime collaboration with Madonna on many different recordings. ...

Since he left Toto, Frederiksen has collaborated with former Babys bassist Ricky Phillips and has released a solo album entitled Equilibrium. He was also one of two vocalists in the debut album of AOR act Mecca. Is now part of The World Classic Rockers, www.wcr.com, with lots of other great rock acts. Ricky Phillips is a bassist who has played in The Babys, Bad English, and Coverdale Page. ...

Sang under the alias of David London in the early 80's. As David London, Fergie released a music video, Samantha, that appeared as a video interlude on HBO and on USA network's Video Concert Hall. This song was also on the Soundtrack of the Village People movie You Can't Stop the Music.

Fergie is involved in bringing awareness of Hepatitis C, a disease he has been struggling with himself. Hepatitis C virus (HCV) is the most common chronic blood-borne infection in the United States. Fergie have arranged benefit shows for the American Liver Foundation, with the cause of fighting Hep C, website found at Fergie's RoCk.

He has an official website at fergiefrederiksen.com.