He has served as the chaired professor of mechanical engineering since 2013[1][2] and is a professorial fellow at Harris Manchester College.

[4] Roy also held research posts at the University of Washington’s Applied Physics Laboratory (1991–1996) and the University of Mississippi’s National Center for Physical Acoustics (1988–1991).

[6] During 2006–2007, he spent a year at Balliol College (University of Oxford) as the 65th George Eastman Distinguished Visiting Professor.

He has engaged industry by way of numerous consultancies and service on directorial and advisory boards, most recently First Light Fusion, an Oxford spin-out focused on novel technology for fusion energy production.

[9] In 2006, he was conferred the Oxford MA ad eundem, by special resolution.