He is known for playing the role of Hal Everett in the American sitcom television series Nanny and the Professor.

[5] At the age of seven, Doremus appeared in commercials, while also saving money to attend the Herman Ostrow School of Dentistry of USC.

[5] Doremus began his television career in 1970, first starring in the new ABC sitcom television series Nanny and the Professor playing the role of "Hal Everett", in which he co-starred with Juliet Mills, Richard Long, Trent Lehman and Kim Richards.

[4] With his role in Nanny and the Professor, Doremus achieved fame, necessitating him hiring two secretaries for his fan mail.

After retiring from acting, Doremus served as a manager of an electronics installation company in Los Angeles.