Prior to taking the bench, Rosen was a senior partner in the law firm of Miller, Canfield, Paddock and Stone.

Rosen served on Senator Griffin's staff in Washington for five years, from February 1974 through January 1979, during which time he was intimately involved in some of the most significant and challenging issues of the period.

While serving as Senator Griffin's Legislative Assistant, Rosen attended the George Washington University Law School at night, and obtained his Juris Doctor in May 1979.

As a member of that Committee, he was actively involved in developing sentencing and criminal law and procedure policy for the Judicial Branch of the US Government.

[1] Beyond his professional work, Judge Rosen is involved with several charitable and community organizations, including serving on the Board of Directors of Focus: HOPE and the Michigan Chapter of the Federalist Society.