Brad Allenby joined the Department in 2004 after spending over twenty years working for AT&T as counsel, senior environmental counsel, research vice president for technology and environment, and environment, health and safety vice president. During that period he also served for two years as Director of Energy and Environmental Systems at Lawrence Livermore National Labs, and as the J. Herbert Holloman Fellow at the National Academy of Engineering. He also taught as an adjunct professor at Yale University School of Forestry, Columbia University's School of International and Public Affairs, Princeton Theological Seminary, and the University of Virginia's School of Engineering and Applied Sciences.