During his residency at Mass General (Harvard University School of Medicine), Dr. Dhallan and his wife suffered two miscarriages. After discovering a lack of information and prenatal testing options available, Dr. Dhallan made it his mission to invent an improved prenatal diagnostic exam – one that did not have a risk of miscarriage or lacked in accuracy. In September of 2000, Dr. Dhallan left his position at Holy Cross Hospital and founded Ravgen (Rapid Analysis of Variations in the GENome), with the primary goal of developing non-hybridization-based DNA sequencing methods to allow rapid and simultaneous detection of hundreds of informative coding sequences.