Jeffrey Greenberg

Builder of Product: An innovative CTO with an artful sensibility

Career Summary

With decades of technology innovation and leadership, in startups and established major corporations, I provide CTO or VP Engineering experience and entrepreneurship. Having created software and applications (for which patents have been awarded), I’ve led large teams (up to 200 people), managed significant budgets (in excess of $50MM) and directed major capital projects (upwards of $80MM).

As an entrepreneur I have been the CTO and founder of a number of leading edge startups, and a CTO consultant to VCs, CEOs and founders. I've participated in company formation, successful M&A, and investment situations for both early and late-stage companies. Also I enjoy writing code! But my art background, which has been recognized with NEA grants and foundation awards, provides me with sensitivity toward the variety of disciplines and sensibilities necessary for modern business creation.




Founder of Lines -- Puzzle Game (2013-present)
Founder of (2009-present)
CTO for (2007-8)
CTO consulting, Technology Strategy and due diligence (2007-present)
CIO & CTO for Liberty Travel (2005-2006)
Founded Inventivity LLC (1999-present)



Acuson/Siemens (1996-99)
NYNEX/Verizon (1993-1996)
New Tools, Inc. (1991-94)
Bell Laboratories, Bellcore Research, Nynex/Verizon Research,
Prodigy Inc, Auragen Systems Corp. (pre-91)



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Artistic Recognition

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Publications & Courses

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Business Sectors

Mobile Apps, casual gaming, health insurance, medical diagnostics, medical health records, technology, software, hardware, retail consumer, business services, music, marketing, social media, internet, venture capital, travel, consulting, Telecom, consumer media, networking


• MFA & BA: Bioengineering & Visual Art, University of California, San Diego (UCSD).
• Multiple academic honors and scholarships.


LAMP, Javascript, C++, C, PHP, Java, Perl, Memcache, Node, SVN, WAP, XSLT, XML, VoiceXML, Dojo, JQuery, Scalable architectures, CometD, MySQL, Memcached, APC, Amazon Cloud AWS, EC2, EBS, S3, STL, LISP, Sparc, UNIX, LINUX, AIX, Solaris, TCP/IP, OS internals, expert systems, Windows APIs, machine learning, Mechanical Turk

Volunteering & Open Source

• Primary author of projects in C++, Linux, Windows, and COM. On Sourceforge
• Volunteer Account Director at Taproot Foundation
• Volunteer on Technical Committee for Presidio Hills School in Francisco

Notable Engagements

Over the years, I've had the opportunity to work with a variety of companies on projects that encompassed all aspects of technology, software development and management. While at times, these assignments were undertaken as a consultant, it has always been my belief that once a task was undertaken, it was my role to be a member of the team and function as any other employee.

At Liberty Travel, where my role lasted nearly two years, I was involved with everything from hiring a new CTO and Vice President of Engineering to developing a strategy for software development and acquisition. At Hewitt, it was working with one of that firm's largest clients. Sometimes this involved taking a leadership position, sometimes it meant working in a secondary role, but it always succeeded because of the collegial nature of the relationships. The bottom line is that flexibility has turned out to be one of my key attributes. I've observed that many otherwise successful and smart managers fail because they are unable to adapt to changing situations. Having been successful with a singular approach in a previous job, they fail to recognize the need to assess a new assignment and to take into account differences in management, culture and industries.

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Served as CIO

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Consulted on Engineering process improvement

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Founded & served as Principle Consultant

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Consulted as Primary System Architect

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Consulting CTO

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Technology due diligence/p>

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Consulting CTO


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Every career has it’s highlights and one of those for me occurred while I was working at Acuson Corp. maker of state of the art diagnostic ultrasound and now a division of Siemens. As the team leader, I was instrumental in the product development, design and delivery of a Java-based medical application, dubbed WebPro. This system allowed physicians, for the first time, to review ultrasound examinations over the Internet. WebPro ultimately became an entire line of products for Acuson.

Lorem IpsumCisco chairman John Chambers recognized this achievement in not only the Cisco quarterly report, and in his keynote speech at a health industry conference, but also in a demonstration with then Vice President Al Gore and visiting high government officials from Russia.

“With new internet applications such as [the] WebPro package, health care professionals can use Internet technology to make online medical assessments for patients 24 hours a day, delivering cost-effective ultrasound diagnosis anywhere the physician is located.”
— John Chambers, CEO Cisco

I also had the chance to do some unique research with voice and touch interfaces for improving medical workstation products, and research into reducing speckle on ultrasound images. I was awarded a sole patent US6514201 for this interface work, and a patent US6511426 as a co-inventor for the medical imaging enhancement work.

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Early in my career, I was fortunate enough to have invented and commercialized one of the first “drag and drop” interfaces for Windows. Even before Microsoft itself was able to accomplish it. It was an entirely new product category in which many players followed.

Here’s what was said at the time:
“WinTools offers the most powerful tools for customizing the Windows desktop that PC Week Labs has tested…”
—PC Week

“A revolutionary revamping of the way Windows works and looks!
...You’ll love WinTools.”

—PC Magazine

“WinTools is the most gracefully graphical way to work in Windows…
Get Wintools. It’s great stuff.”

—Computer Shopper

“If you’re a Windows fanatic, you’ll love it…”
—From John Dvorak


Fault-tolerant, distibuted UNIX OS

I helped design and implement large parts of the Auragen fault-tolerant operating system based on UNIX. From this early distributed and fault-tolerant system we learned many lessons that are relevant today: the advantages and challenges of using thousands of computers for large computing tasks and reliable operations. This paper was an important computer science paper with more than 300 citations. Our work there was important as one of the first pure software solutions to operating systems fault-tolerance through parallelism and loosely synchronized computers. The system competed with Tandem and Stratus's approaches, and was ultimately sold to Siemens.

I worked on implementing about 90% of UNIX system calls and implemented an early virtual memory paging implementation. It was also great experience for working close to the metal and having a very deep understanding of software and systems. I worked closely with Anita Borg who later worked passionately on opportunities for women in technology.


Embracing Change and Innovation

Different Minds, Metrics and Value Creation

Technology Innovation

Strategic Vision