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Sentinel's Management team has worked together since founding the company in 1982, and they continue to provide leadership today. Key members of the management staff are listed below.

Dennis Hoelzer, President & Chief Executive Officer.

Dennis Hoelzer is one of the founders of the organization. When he helped found Sentinel in 1982, he was the corporation's Vice President and focused primarily on new business development. Since 1989, when he constructed a leveraged buyout of 51% of Sentinel's stock, he has held the post of President and CEO. Prior to founding Sentinel, he was vice president of Computer Resource Management, Chicago, Illinois, from 1981-82, and worked for Control Data Corporation from 1971-1981.

James Emmel, Chief Operating Officer and Secretary.

James Emmel has been with Sentinel since 1984. James was originally hired as Vice President of Operations and was named Chief Operating Officer in 1989. Prior to joining Sentinel, he served as an engineering service District Manager for Control Data Corporation from 1974-84, as a Technical Support Engineer for Comma Corporation from 1972-74, and as a field engineer for IBM Corporation from 1966-72.

Timothy Hill, Chief Financial Officer and Treasurer.

Timothy Hill joined Sentinel in 1985 as a Controller and was elevated to VP of Finance in 1987 and CFO in 1989. He is a graduate from Elmhurst College and a certified public accountant. He received his MBA in Tax Accounting from DePaul University in Chicago in 1994. Prior to joining Sentinel, he worked for Wolf & Company from 1984-85, and for Coleman, Epstein & Berlin Company from 1982-1984.

Brian Osborne, Executive Vice President, Sales & Marketing.

Brian Osborne has been with Sentinel since 1982. He began at Sentinel as a marketing representative, became Sales Manager in 1985, and was named VP of Marketing in 1987. In 1989, his duties were expanded and he was elevated to Executive VP of Sales and Marketing. He is a graduate of Lewis University in Romeoville, IL, and has received his Masters of Business Administration from the University of Chicago.

Jay Hackney, Executive Vice President, Operations.

In Memoriam of Jay Hackney
Tragically, our dear friend and incomparable co-worker, Sentinel Sr. Vice President Jay Hackney passed away on Jan. 31, 2013. Jay has been with Sentinel since 1984 and has been a cornerstone of our company’s success.

Jay was a friend first, always willing to help or assist anyone when needed. As the leader of Sentinel’s Operations department and a key member of the Executive team for many years, Jay showed tremendous creativity in addressing customer needs. He also applied a tireless work effort to ensure Sentinel made good on our promise to deliver “uncompromising customer service.”

Some simple words to describe Jay would be; fearless, driven, dedicated and compassionate. The team at Sentinel described Jay as the most “optimistic pessimist” the world will ever know. When Jay was presented with a problem he immediately saw an amazing opportunity and the problem became nothing more than a bump in the road that needed to be fixed. He was a fixer; a really great one.

In spite of all the hours he spent on Sentinel business, Jay was a family man first. He and his wife raised three wonderful children and they also have two grandchildren. The family spent much time together at home or on family vacations in Michigan and Florida.

Jay will be sorely missed but he will never be forgotten - in our hearts, he will forever remain.

George Kalidonis, Director.

George Kalidonis currently serves on Sentinel's board of directors and is a member of the Core Faculty at Capella University. Previously George was the president and chief executive officer of Technology Planning and Development Corporation and earlier had worked as an executive at Blackman Kallick LLP Accounting.

Ralph Moore, Director.

Ralph Moore currently serves on Sentinel's board of directors, and is the president of Ralph G. Moore & Associates. RGMA is one of the nation's premier change management firms specializing in integrating supplier diversity into corporate strategy and the formation of diverse strategic alliances. Previously Ralph was with Arthur Andersen & Co. and served as vice president for a Chicago based Minority Enterprise Small Business Investment Company (MESBIC). His full autobiography appears here.

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