Screenwriter and producer, most recognized for his work on the classic sitcoms Three's Company, All in the Family, and The Jeffersons.
He was born in the UK, in Sunderland.
He worked as publicist in England before moving to the US in 1968.
He married his wife, Gee, who established a program to nurture new talent called the Don and Gee Nicholl Fellowship in Screenwriting.
He wrote Three's Company, which starred actress Suzanne Somers as the ditzy Chrissy Snow.