(mid 20th C)
Robert Mullen was active/lived in California. Robert Mullen is known for sculpture.
Biography Robert Mullen
Berkeley sculptor exhibited at Paul Rivas Gallery, LAT, April 15, 1963, page C 8; instructor at Stanford University exhibited his work at Decorators and Home Furnishings Show, Pan Pacific Auditorium and Paul Rivas Gallery?, LAT, September 8, 1963, page D 29.