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About Us

OnSIP was founded in 2004 and now delivers real-time communications services over a geographically distributed platform to more than 25,000 businesses.

Principals & Management

John Riordan

Cofounder, Co-CEO & CTO

John first got involved with computers in the late 70’s – Apple II, Commodore PET, TRS-80. He studied computer science and cognitive science at MIT in the late 80’s. “While I spent a good deal of time trying to learn all I could about how brains work, I ended up getting sucked into doing work under Andrew Lo at Sloan.” After school he spent a few years doing software engineering on Wall Street, jumping into the internet in 1994. Since that time, he’s been an Internet entrepreneur and engineer. He has spent most of his career doing Internet service and software engineering.

Rob Wolpov

Cofounder, Co-CEO & COO

Rob holds his M.B.A from Columbia University. He received a B.S. in Finance from the Wharton School of Business and a B.A. in Economics at the University of Pennsylvania. He began his career as a software engineer for the Frustum Group, a provider of leading foreign exchange trading software. He has planned and launched multiple technology ventures including Nemex, Inc. and ASP Junction, which was purchased by LivePerson, Inc. Before forming Junction
Networks, Rob worked as a consultant in the Financial Services practice for IBM Business Consulting Services, advising some of the largest financial institutions.

Mike Oeth

Cofounder, Co-CEO & CCO

Mike graduated from Harvard College in 1991 with a degree in Economics and went to work for a software company based in Greenwich, CT. Since then, he has always worked for a technology company in one form or another – cable companies, fiber optic providers, Internet service providers, and application service providers. His roles have ranged from technical support, sales, business development to executive management.