 Additionally he worked on topics related to space exploration and solar-type activity in nearby stars.In addition to his position with the University of Arizona, Worden served as a consultant to the Defense Advanced Research Projects Agency (DARPA) on space-related issues.During the 2004 Congressional Session he worked as a Congressional Fellow with the Office of Senator Sam Brownback (R-KS), where he served as Senator Brownback's chief advisor on NASA and space issues.