Dennis is the original “voice” of “The Buckinghams”. The Chicago-based group that scored a string of five Top Ten hits in the late-sixties including, the #1 “Kind of A Drag”, “Don’t You Care”, “Mercy, Mercy, Mercy”, “Hey Baby, They’re Playing Our Song”, “Susan”, and “Back In Love Again”. Following his success in The Buckinghams, Dennis was part of the song-writing duo “Tufano and Giammarese” and recorded three albums with Lou Adler’s custom label, Ode Records. Appearing as a guest vocalist, he went on to co-write with renowned composer and musician Tom Scott. With Scott as composer, Dennis performed the “original title/theme song” for the long running “Family Ties” television show.

Dennis also wrote the music and performed with Bernie Taupin, Elton John’s lyricist, on Taupin’s album, “He Who Rides the Tiger”. Subsequently, he teamed again with Taupin to co-write, co-produce and perform the Farm Dogs album “Last Stand In Open Country”.

Back on the road, Dennis joined Olivia Newton-John on her hugely successful tour and was featured, with her on the HBO Special in two dramatically inspired duets.

As an actor, Dennis has worked in film, television, radio and commercials.