· CEO and Co-founder, BitRipple Inc.2020–
· Senior Researcher, University of California, Berkeley2019–
· VP Technology, Qualcomm2009–2018
· Founder and CTO, Digital Fountain Inc.1999–2009
· Theory Group Leader, International Computer Science Institute (ICSI)1989–1999
· Associate Professor with tenure, University of Toronto1988–1990
· Assistant Professor, University of Toronto1985–1988
· Postdoctoral Researcher, University of Toronto1983–1985
· PhD in Theoretical Computer Science, University of California, Berkeley1979–1983
· BSc in Applied Mathematics, Massachusetts Institute of Technology1971–1975