Dr. Walsh holds a Ph.D. in Applied Mathematics from the University of Melbourne. Following his Ph.D., he worked in postdoctoral and research positions in the United States at the University of Minnesota, Cornell University, and Lawrence Livermore National Laboratory. He returned to Australia in 2015, and started a research consultancy/software development company: Stone-Code Pty. Ltd, before taking a position at the School of Petroleum Engineering at the University of New South Wales. In 2018, Dr. Walsh returned to Melbourne, joining the Department of Civil Engineering at Monash as a member of the Resources Engineering division.

Dr. Walsh's recent research work has focused on the development of tightly-coupled geomechanical, hydrodynamic and geochemical multiscale models and their application to geoscientific and engineering problems. This work has included studies of integrated field development for offshore oil and gas, geothermal energy production, carbon-sequestration, and hydraulic fracturing operations, as well as the development of novel stimulation and drilling technologies.