David Grewell received a BS, MS and Ph.D. in Welding Engineering from The Ohio State University with minors in biomedical engineering and polymer processing in 1989, 2002 and 2005, respectively. He holds 14 patents and has published numerous publications, including two books. His interests include joining of plastics, micro-fabrication, laser processing of materials, bioplastics and biofuels. He currently works at Iowa State University in the department of Agricultural and Biosystems Engineering. His research group focuses on using high power ultrasonics to enhance biofuel production as well as on using plant proteins for biorenewable, biodegradable plastics and composites. He also has a position at the University of Erlangen in Germany. Dr. Grewell has also been an invited speaker at numerous international conferences.