He founded Rosen Hotels & Resorts in 1974, and served as the company's president and chief operating officer.
Rosen eventually joined the Walt Disney Company as director of hotel planning.
[1] To market his hotel during this period, Rosen hitchhiked to New England and met with several motor coach companies to gain their Central Florida business.
[2][7] Rosen's philanthropic efforts began in 1993, when he created the Tangelo Park Program[2][8] to benefit an impoverished Orlando community of the same name.
In addition, Rosen funded the building and maintenance of a 24-room preschool housed at the Orange County Public Schools Academic Center for Excellence in Parramore which opened in August 2017.
In November 2017, Rosen announced a partnership with Rollins College, a private, liberal arts college in Winter Park, to provide three annual scholarships to the school to be shared by Tangelo Park and Parramore high school graduates.
For years, Rosen has funded sending medical supplies and personal hygiene items to Haiti.
He set up a foundation in Adam's name and donated millions to fund brain tumor research at the University of Florida.
Rosen died on November 25, 2024, at his home in Orlando at the age of 85 following complications related to a brief battle with ampullary cancer.