[4][5] From 1983 to 2003, he was a professor at the University of Arizona[6] and continues to author works in peer-reviewed journals and science magazines.

From 2006 to 2011, he was the Laboratory's principal associate director for Science, Technology, and Engineering, during which he implemented the capability model for scientists and engineers and developed the science pillars that guide the Laboratory's institutional investment strategies.

He was also chairman of the Incorporated Research Institutions for Seismology (1994-1996) and is a current member of the Air Force Technical Applications Center‘s Seismic Review Panel (2000–present).

In 2011, a mineral Terrywallaceite was named after him in recognition of his efforts in education, research, and service to mineralogy.

He has visited mining communities and mineral localities across both North and South America, and has written extensively on various aspects of mineralogy for amateurs.