Moshe Bar is an Israeli technologist, author, investor and entrepreneur.

An Israeli and US citizen, he is a co-founder of Qumranet

Qumranet

Qumranet, Inc is an enterprise software company offering a desktop virtualization platform based on hosted desktops in Kernel-based Virtual Machines on servers, linked with their SPICE protocol...

. Qumranet was sold to Red Hat in 2008 for US$ 107 million.

He previously founded the company behind the Xen

Xen

Xen is a virtual-machine monitor providing services that allow multiple computer operating systems to execute on the same computer hardware concurrently....

 software, XenSource, which was sold to Citrix for US$ 500 million in 2007. Before that he founded Qlusters Inc, and was the founder, main developer and project manager of openMosix

OpenMosix

openMosix was a free cluster management system that provided single-system image capabilities, e.g. automatic work distribution among nodes. It allowed program processes to migrate to machines in the node's network that would be able to run that process faster...

. Furthermore, he frequently acts as an angel investor

Angel investor

An angel investor or angel is an affluent individual who provides capital for a business start-up, usually in exchange for convertible debt or ownership equity...

 in high-tech start-up companies

Startup company

A startup company or startup is a company with a limited operating history. These companies, generally newly created, are in a phase of development and research for markets...

 such as Sullego, Hyper9, and others. He was also involved in Qlayer, sold to Sun Microsystems in January 2009.

The author of several books on Linux

Linux

Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

, file system

File system

A file system is a means to organize data expected to be retained after a program terminates by providing procedures to store, retrieve and update data, as well as manage the available space on the device which contain it. A file system organizes data in an efficient manner and is tuned to the...

s and open source

Open source

The term open source describes practices in production and development that promote access to the end product's source materials. Some consider open source a philosophy, others consider it a pragmatic methodology...

 development, he was also a senior editor at Byte Magazine for over eight years.

He has authored several academic papers on high-performance computing and taught at Tel Aviv University

Tel Aviv University

Tel Aviv University is a public university located in Ramat Aviv, Tel Aviv, Israel. With nearly 30,000 students, TAU is Israel's largest university.-History:...

, and is a frequent speaker on subjects such as virtualization, enterprise software, Linux, and free software

Free software

Free software, software libre or libre software is software that can be used, studied, and modified without restriction, and which can be copied and redistributed in modified or unmodified form either without restriction, or with restrictions that only ensure that further recipients can also do...

.

Before entering the high-tech business, he was a career officer in the Israel Defense Forces.