Our Team

Jeff Altenburg,  President and founder


Jeff has held leadership roles at some of the world’s most successful telecommunication, construction and renewable energy companies including Bechtel, T-Mobile and EnXco. Jeff is a project management professional with over 30 years of comprehensive experience working throughout the United States, Australia, Mexico, and points beyond.

Jeff is the CEO of CerCis Consulting and founded the company in 2009. CerCis is a privately held software development and consulting firm working in telecommunications and renewable energy. The designer and developer of Plan A2Z Software; a project management tool tailored to developers of large infrastructure projects in telecommunications, renewable energy or electric vehicle charging stations.

Jeff’s background includes commercial pilot and flight instructor (CFI, MEII), mountaineering and climbing guide, general contractor, with additional studies in aeronautics, aviation, engineering and design.

Jeff’s is an active supporter of KIVA, and Mercy Corps. and was awarded a certificate for their Good Samaritan Society in 2007.

Jesse Barnum,  Chief Technical Advisor


Jesse is the Chief Technical Advisor and head software developer for CerCis Consulting. He is a member of the advisory board. Jesse started writing screen savers on his Apple IIe at age 12, and immediately fell in love with computer programming. His database experience goes back to PFS:File in the early 1980s, but he started writing databases with FileMaker Pro version 2.1 in 1992. He founded 360Works in 1996, and created a niche integrating FileMaker and Java for organizations like NASA, the US Marines, and Omnicom. He has created numerous developer tools including the WooF JDBC driver and AdminAnywhere.

Jesse hosts, organizes, and frequently presents at the Atlanta FileMaker Developers group. He has been a speaker at the 2008 and 2009 FileMaker Developer Conference, the Adatasol podcast series, and FMPug chapters in numerous cities around the United States. He is certified in FileMaker 7, 8, 9, 10, and 11, and is a platinum member of the FileMaker Business Alliance.

At the 2009 FileMaker Developer Conference, Jesse was surprised and honored to receive theFileMaker Excellence Award for Outstanding Contribution to the FileMaker Community.

Frank W. Yuen,  Business Manager


Frank is a CerCis board member overseeing operations, actively participating in corporate business strategy, policy and implementation. Frank has advised both public and commercial enterprises enabling successful business and product innovation.

The publishers of Law & Politics and San Francisco Magazine lists Mr. Yuen for 2005, 2006, 2007, 2008 & 2011 as a “Super Lawyer” for Northern California, a distinction given to less than 5% of attorneys.

Mr. Yuen has taught classes for attorneys on the subjects of Limited Liability Company and Partnership planning for a National Business Institute and Estate Administration with Wealth Counsel, LLC.

Frank is a California State Bar Certified Specialist in Estate Planning, Trust and Probate (one of 48 in San Francisco in 2010) attorney practicing in San Francisco. He received a B.A. in International Business and Political Science from California State University at San Francisco. Mr. Yuen was a nationally selected Coro Fellow in Public Affairs (1972) for Northern California. Mr. Yuen received an M.A. in Urban Studies from Occidental College and a J.D.-M.B.A. (Taxation), and LL.M. in Taxation from Golden Gate University. Mr. Yuen was admitted to the State Bar of California for the practice of Law in 1977.



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