Karen, described as “the man who designed the 1970s”, studied aeronautical engineering and took charge of Ogle Design as MD and chief designer in 1962 after previously working in the aircraft industry, and with Ford, Hotpoint and Phillips.
During his time at Ogle, he oversaw the design of the Bush Radio TR130 radio, the Raleigh Chopper, the Bond Bug, the Reliant Scimitar GTE, the Anadol A1 (FW5), a series of lorry cabs for Leyland, and the Marble Run toy.
He retired from Ogle in 1999 but continued to enjoy creating and designing.
Karen was appointed an OBE for his services to design and his sketchbooks are held at the Victoria and Albert Museum.
Reflecting on his creations, he singled out Marble Run, as his “most inspired creation”.