Daniel P. Sheehan is a Professor of Physics at the University of San Diego and has had a lifelong interest in the phenomenon of time.
He received his B.S. in chemistry from Santa Clara University in 1981 and his Ph.D. in physics from University of California, Irvine in 1987. His research interests include exotic plasmas, planetary formation, nanotechnology, and chemical physics. Over the last 25 years he has been investigating theoretical and experimental challenges to the second law of thermodynamics. He co-authored the first scientific monograph on the subject (2005) and also organized the first international conference devoted to it (2002). Over the last ten years he has become involved in the physics of time, particularly retrocausation, the proposition that the future can influence the past. He organized three AAAS symposia on this subject (2006, 2011 and 2016), and plans to host another in 2021.