Trained as a physicist and an engineer, Prof. Roy specializes in the application of physical acoustics principles to problems in biomedical acoustics, industrial ultrasonics, and acoustical oceanography. Sonoluminescence (light from sound), acoustic cavitation dynamics, shock-driven cavity collapse physics, bubble-mediated therapeutic ultrasonics, and light-sound interactions are topics of past and current interest.

He has served on numerous professional society committees, review panels, editorial boards, and is a past Editor-in-Chief of Acoustics Research Letters Online (now called JASA-EL).

He is a Fellow of the Acoustical Society of America (ASA) and a recipient of the Helmholtz-Rayleigh Interdisciplinary Silver Medal of the ASA.