Question: Raymond Albert Patterson, Jr., was general manager of the NBA's Houston Rockets from 1972 to which year, among his most notable player acquisitions was Hakeem Abdul Olajuwon, a Nigerian-American former professional basketball player?
Sentence (from "Ray Patterson (basketball)"): He left the Rockets in 1990 with hopes of becoming co-owner of an NHL team in Houston, and was succeeded by his son, Steve.
Relevant evidence: No