[1][2][3][4][5] He is the founder, chairman, and owner of Triangle Financial Services, a sports and entertainment investment firm, and the owner of both the Maccabi Haifa basketball team in Israel and the Miami Midnites basketball team in the United States.
[5] Rosen was the President, COO, and owner (with his brother Lawrence and father Sydney) of Rose Art Industries Inc., a toys, stationery, and art and crafts manufacturing and supply company based in Livingston, New Jersey, from 1977 to 2006.
[11] He and his brother and father sold the company in 2005 for approximately $350 million, at a time when it had 1,000 employees and 10% of the US arts and crafts market, behind only Crayola.
[10][11] Thereafter, Rosen founded, and is the chairman and owner of, Triangle Financial Services LLC, of Aventura, Florida, a sports and entertainment investment firm.
[2][10][6] It invests internationally in sports enterprises, and sponsors a Hong Kong semi-pro baseball team (the Dragonfliers).