Mark joined NRC’s risk analysis group a few months before the final publication of the Reactor Safety Study. He continued his involvement in NRC risk analysis for another 35+ years, retiring in early 2011 as Director, Division of Risk Analysis, Office of Nuclear Reactor Regulation. Since then, he has provided consulting services in risk management to government, universities, and private industry. He holds a Bachelor’s degree from the University of Florida and a Master’s degree from MIT, both in nuclear engineering.