Mark does software development and R&D on technologies at PayPal and deploys into their family-remittance money transfer service. Mark has served in various individual contributor and management capacities at AT&T, Sprint, EarthLink, Sun, and Oracle before joining PayPal in 2012. He received his Ph.D. in Physics in 1990, and did postdoctoral work at IBM Research in New York. He currently resides in Sonoma County with his wife and family.