His current research interests include the genetic and environmental determinants of vascular patterning and the development of quantitative imaging techniques for assessing morphology and function. John received an M.Eng. in 1997 from the department of biomedical engineering at McGill University for his work on the causes and remedies of intensity non-uniformity artifacts in MRI. He received his Ph.D. from the department of electrical engineering at McGill University in 2001 for his work on quantitative magnetization transfer imaging. From 2001-2003, he was a postdoctoral fellow in Imaging Research at Sunnybrook Health Sciences Centre with Dr. Mark Henkelman. During that period, he investigated the use of micro-computed tomography for characterizing the microvasculature of whole organs.