Durand R Begault PhD has provided expertise in over 800 audio-video and acoustic forensic cases since 1987. He has given expert testimony over eighty times, in U.S. Federal and State courts including the United States International Trade Commission (USITC), and courts in Canada and International arbitration panels (World Bank-ICSID) in areas including audio-video media authenticity & enhancement, audibility of speech and warning signals, ear witness testimony, musicology, and patent cases.