An electrical engineer working in signal processing. [ref]
https://www.eecs.mit.edu/people/alan-oppenheim/. MIT EECS profile: engineering title, EE discipline and Signal Processing research area
He authored lecture notes and transparencies. [ref]
Continuous-Time Modulation by Alan V. Oppenheim. Continuous-Time Modulation, PDF p. 14: individual authored-resource attribution
Professor Alan Oppenheim
. Portrait by SJMW1987, licensed CC BY-SA 4.0. Source.