Prior to joining the A's, Romanick, 46, served as a coach and pitching coordinator in the Seattle Mariners organization from 1992-98.
Romanick's Major League career spanned three seasons (1984-86) with the California Angels, for whom he posted a record of 31-29 and a 4.24 ERA in 82 appearances, all starts.
He made 33 starts for the Angels as a rookie in 1984 and went 12-12 with a 3.76 ERA, and he went 14-9 in 1985. After going 5-8 in 1986, Romanick was traded to the New York Yankees and spent the 1987 season with Triple-A Columbus. He retired in 1988 after spending one year in the Milwaukee farm system.
A native of Bellevue, Wash., Romanick pitched in college at Arizona State University. He replaces former bullpen coach Brad Fischer, whose 29-year association with the organization ended when it was announced last week that his contract would not be renewed.
There remain two openings on manager Bob Geren's staff. Bench coach Bob Schaefer and third-base coach Rene Lachemann also were relieved of their duties last week.
Marshall, Thompson claimed: Lefty reliever Jay Marshall and outfielder Kevin Thompson were claimed off waivers Monday, Marshall by the Red Sox and Thompson by the Pirates.
Marshall, selected out of the White Sox organization in last winter's Rule 5 Draft, spent the entire 2007 season in Oakland, going 1-2 with a 6.43 ERA in 51 relief appearances. He fell out of favor after the All-Star break, making 14 appearances in 74 games and allowing 11 earned runs over 12 2/3 innings.
Thompson, who was claimed off waivers from the Yankees on Sept. 7, was 1-for-14 (.071) in nine games, including three starts with the A's.
Mychael Urban is a national writer for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.