sentences:  He founded the company DARcorporation with Willem Anemaat.Roskam received his Engineer's degree in aeronautical engineering in 1954 from the Delft University of Technology followed by a Ph.D. degree from the University of Washington in aeronautics and astronautics in 1965.Roskam has been involved in the design and development of 36 aircraft programs, including 12 which made it to flight, while working for three major aircraft companies.