Biographies for Mill Road Directors

Justin C. Jacobs

Justin C. Jacobs, 48, has more than 25 years of experience as a public investor, private equity investor, operator, and member of Boards of Directors; he also has significant experience in turnaround situations. He is a Management Committee Director of Mill Road Capital Management LLC, where he has worked since 2005. Mill Road Capital Management is an investment firm focused on investments in small, publicly traded companies. Mr. Jacobs is currently a member of the Board of Directors of Swiss Water Decaffeinated Coffee, Inc. and has previously served on numerous public and private company boards. Mr. Jacobs holds a B.S. from the McIntire School of Commerce at the University of Virginia.

Donald J. Tringali

Donald J. Tringali 65, is an experienced operating executive, corporate director, and business and financial advisor. He currently serves as the Chief Executive Officer of Augusta Advisory Group, a boutique financial and business consulting firm providing a full range of executive, operations and corporate advisory services to companies, a position he has held since founding the firm in 2001. Mr. Tringali has extensive experience serving as an executive officer and on the boards of directors of public and private companies. Mr. Tringali began his career as a corporate attorney in Los Angeles, where he represented public and private companies in general business matters and mergers and acquisitions transactions. Mr. Tringali holds a Bachelor of Arts in Economics from UCLA and a Juris Doctor from Harvard Law School.

About Natural Gas Services Group, Inc. (NGS)

NGS is a leading provider of gas compression equipment and services to the energy industry. The Company manufactures, fabricates, rents, sells and maintains natural gas compressors and flare systems for oil and natural gas production and plant facilities. NGS is headquartered in Midland, Texas, with fabrication facilities located in Tulsa, Oklahoma and Midland, Texas, and service facilities located in major oil and natural gas producing basins in the U.S. Additional information can be found at www.ngsgi.com.