This talk highlights renowned scientist Christopher Clark’s research on the effects of sonar, shipping noise and offshore energy activities on marine mammals at both local and ocean-basin scales. Clark pioneered the ocean listening systems for studying whales and other marine life. His work has been cited by Peter Tyack’s 2010 TED Talk on whale communications. His research has led to a better understanding of the effects of sonar, shipping noise and offshore energy activities on marine mammals at both local and ocean-basin scales.