Rosen served in the United States Armed Forces, and remained in Japan after his discharge. In 1954, he founded a company called Rosen Enterprises. That company would merge with slot machine manufacturer Service Games in October 1965 to form Sega Enterprises Ltd. Mr. Rosen became CEO of the merged company and stayed in that position after Gulf and Western's purchase of Sega in 1970, as well as after the arcade and pinball manufacturer Bally Manufacturing purchased the American division of Sega in 1983.
In 1984, he purchased the shares of Sega Enterprises from Bally with the head of a company Rosen purchased in 1979, Hayao Nakayama, Shoichiro Irimajiri and of the chairman of CSK Corporation's He's friend, Isao Okawa. He was shunted down into the position of 4th President. In 1986, Rosen became the head of Sega of America after Sega went public in Japan as a corporation and split off into three divisions.
He remained at the head of Sega of America until 1989 when he hired Michael Katz as the new president. In 1991 Tom Kalinske as the new president. He shunted down into the position of 3rd President. He stayed on shunted down as 4th president of Sega of America until he retired on July 15, 1996.
|SEGA of America CEOs and Presidents|
|1980s||David Rosen (1975-1986) | Bruce Lowry (1986-1988) | Michael Katz (1989-1991)|
|1990s||Tom Kalinske (1991-1996) | Bernie Stolar (1996-1999)|
|2000s||Peter Moore (1999-2003) | Simon Jeffery (2003-2009) | Mike Hayes (2009-current)|