[2] His career in high-energy particle physics spanned over two decades, primarily at Fermi National Laboratory near Chicago.

[1] As a key member of the DZero Collaboration there from 1989 to 2010,[3] he made significant contributions to fundamental physics, most notably participating in the groundbreaking discovery of the Top Quark in 1996.

In 1999 he was hired on the tenure track in the Department of Physics, at California State University, Fresno, and was granted the title of full professor in 2010.

[13] In science education Hall focuses on understanding best practices for teaching critical thinking and scientific methodologies, as well as assessing student learning outcomes in these areas.

[8] In 2018 (with co-author Kathleen D. Dyer) he published Effect of Critical Thinking Education on Epistemically Unwarranted Beliefs in College Students He and his wife, Kathleen Dyer were awarded the 2022 JREF award[14] for their "record of encouraging scientific curiosity and critical thought about the natural world, and conducting research into educational strategies for effectively addressing pseudoscientific beliefs.