Reidar Thomassen (18 June 1936 – 13 February 2024), known by the pseudonym Richard Macker, was a Norwegian writer.
Thomassen finished his secondary education in Narvik in 1956, took military training in Harstad and studied at the University of Oslo.
Other memorable novels include Den tredje utvei (1970), Seminaret (1976) and Nina Ewert (2000).
He has also written hundreds of crime short stories, and in 2003 he became the first Norwegian contributor to Ellery Queen's Mystery Magazine.
He was the screenwriter for the three television series Farlig yrke (1976), Solospill (1977) and Saken Ruth Vang (1981).