Before that, he was a National Science Foundation (NSF) Astronomy and Astrophysics Postdoctoral (AAPF) fellow at the University of Chicago. Passionate about working with older adults, Dan proposed the L3 program as the broader impacts component of a successful 2009 AAPF proposal. In Chicago, when he wasn’t doing research, Dan coordinated and administered the L3 program. Helping to create and run L3 has been one of the most rewarding adventures of Dan’s career.