"I had the pleasure to have worked with Jon in more than one position over the course of the last 10 years. Jon has always handled the most complex technical projects. He has an intimate understanding of deepest interactions between hardware, operating systems, and software. He is dedicated to consistently finding the optimal solutions and doing things the "right" way the first time around. His problem solving and coding capabilities are tremendous."

Jim Mortko
Senior Director of Software Development & Production, Hearst Corporation

"I worked with and then managed Jon at Amazon.com for a number of months through a series of disruptive reorganizations. Jon was an amazing engineer that could address all of the most challenging technical problems that our team needed to address. Jon operated independently to produce some of the most compelling and leveraged contributions that our team made. He produced simple, reliable frameworks that solved complex problems. I strongly recommend Jon as a solid technical resource to address the most complex of technical issues or build a team around."

Christopher Alef
Manager, Amazon.com

"I worked with Jon during his time at AvantGo where he managed the web group that produced the avantgo.com consumer service website. I had previously managed the group and Jon was hired to replace me (Jon designed the framework we were already using for avantgo.com). Jon is a calm, thoughtful manager and a skilled communicator, but more importantly, he is one of the sharpest people I have ever worked with. His design skills in software architecture are top-tier, and he is one of the most efficient and practical programmers that I have ever known."

Rafael Weinstein
Co Founder, AvantGo, Inc

"Jon was my first hire and direct report for two years. Before Jon: CMP's 20 magazine websites were a typical amalgam of 1994 style static html pages. There was no revenue to speak of, little editorial control and no infrastructure to build a modern website on. After Jon: Over 1 million high-value IT impressions per day across the company sites supported by Content Management with complete editorial-workflow, the most advanced ad-serving technology in the industry (even today) and the most sophisticated dynamic content delivery system in the industry (Mason). Jon combines the strong theoretical background necessary for superior design, the communication skills to get at the real business requirements and their proper prioritization and an amazing productivity in getting things done. On his own, Jon is the best 10-person development team I have worked with."

Gady Costeff
Technical Director, CMP Media

"Jonathan taught classes for several of our Fortune 500 clients and the feedback was consistently superb. He reliably sustained our reputation as a top training company. His Perl expertise and can-do attitude were much appreciated."

Dan Keller
Founder, Dan Keller Technical Services