[5] He worked on Wall Street for 15 years, ending his career as a Senior Technology Analyst and Vice President at Morgan Stanley.
[6][7] In this capacity, Rosen invested in Compaq Computer Corporation in 1981, eventually serving as Chairman for 18 years.
[8] As a financier, Rosen backed high tech startup companies including Electronic Arts, Lotus Development, Ansa Software and Silicon Graphics.
[9] In 1985, at age 52, he was described as "a late bloomer who has had five careers" and "chairman and general partner" of the fund.
[10] In 1999, Rosen was awarded the Founders Medal of the Institute of Electrical and Electronics Engineers (IEEE).