Dr. Potyondy has developed and applied both continuum and discontinuum models to represent damage and flow processes on both a macro- and a micro-scale. His research focus is on microstructural modeling of rock fracture using discrete-element methods. He developed the bonded-particle modeling methodology along with Peter Cundall and continues to develop this methodology. He has directed development of the PFC codes, given more than 45 PFC training courses, developed the structural-element logic in the FLAC3D code, and developed novel techniques for applying micro-mechanical discontinuum models to fracture-related boundary-value problems that are not limited to rock-mechanics applications.