Rosen has been an Associate Researcher at the National Bureau of Economic Research since 1978, where he has focused on taxes and commerce. In 1981 he was a visiting scholar at the Hoover Institute, and in 1986 was a Fellow at the Econometric Society. From 1989-1991 he worked at the United States Department of Treasury as the Deputy Assistant Secretary for Tax Analysis.
Rosen has been an Associate Researcher at the National Bureau of Economic Research since 1978, concentrating on taxation and trade. In 1981 he was a visiting scholar at the Hoover Institute, and in 1986 he was a Fellow at the Econometric Society. From 1989-1991 he worked at the United States Department of Treasury as the Deputy Assistant Secretary for Tax Analysis.