Mark Williams (born August 22, 1959) is an English actor, comedian, presenter, and screenwriter. He gained widespread recognition as one of the central performers in the popular BBC sketch show The Fast Show. Williams also made recurring appearances as Brian Williams in the BBC television series Doctor Who and as Olaf Petersen in Red Dwarf. Beyond his acting work, Williams has presented several documentary programs exploring his passion for industrial history. His diverse career spans comedy, drama, and historical exploration. Download and Mark Williams's books in PDF and EPUB format.