Famously secretive about his age, Haas, who suffered a heart attack earlier in the year, is believed to have been in his late seventies when he passed away last Friday.
A life member of D&AD, Haas was as well known for his prolific output of print work for clients including Barclays, Volkswagen, Shell and the Army, as he was for an enthusiasm for the business that never diminished.
Haas was still working part-time at Bates Dorland in the late 90s, and drawing and painting into his final years.
Tony Brignull, the ex-creative director who worked with Haas at the former Vernons agency and Collett Dickenson Pearce, said: "Derrick was one of the most enthusiastic people I ever met in advertising. He loved the companionship he found in the business and always got on well with young creatives. He was unstinting in his help to them."