Gregg appeared in the PBS/Nova series Inside Animal Minds, and has been interviewed about dolphin cognition and animal behavior by The Boston Globe, New York Times Magazine, Süddeutsche Zeitung, New Scientist, Big Picture Science, The Smithsonian, Salon, Wisconsin Public Radio, SVT Nyheter, Der Spiegel, and The Sunday Times. As a voice actor, Gregg has collaborated with major animation studios like the Emmy award winning Magma Productions, and can be heard in the starring role of Thor in Thor: Legends of Valhalla (trailer below):