Rosing was an engineering manager at Digital Equipment Corporation (DEC) and Data General in the 1970s.
He was then chief technology officer at Caere Corporation, which developed the optical character recognition product OmniPage.
[2] In May 2005 he was appointed a senior fellow in mathematical and physical sciences at the University of California, Davis, and continued to serve as an advisor to Google.
At Davis, Rosing consulted on the Large Synoptic Survey Telescope project (now the Vera C. Rubin Observatory).
[4] In 2010, he partially endowed a professor in theoretical astrophysics at the University of California, Santa Barbara held by Lars Bildsten.