Previously, he was an associate professor in the Mechanical, Materials, and Aerospace Engineering Department at the Illinois Institute of Technology. He received his B.S. in Aeronautical and Astronautical Engineering from MIT (1987), and his M.S. (1997) and Ph.D. (1998) in Mechanical Engineering from the University of California, Berkeley. Prior to joining the IIT faculty, Dr. Clack was an NRC Postdoctoral Fellow in residence at the National Institute of Standards and Technology in Gaithersburg, Maryland (1998-1999) and a member of the technical staff at the Rocketdyne Division of Boeing Corporation (1987-1992). He is engaged in research and publication in the areas of emission and control of air pollutants, aerosols, non-thermal plasmas, and transport phenomena within dispersions.