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.
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.
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.
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.
Chief Operating Officer
Robert Lenartowicz has been with Sentinel since 1990. He began at Sentinel as the Director of Information Technology. In 1994, his duties were expanded to VP of Consulting Services. He is a graduate of Elmhurst College, and has his Masters of Business Administration specializing in Information Technology from Illinois Institute of Technology (IIT).
Chief Technology Officer
Robert Keblusek has an extensive 30+ year history with Sentinel, initially joining the company on a part-time basis while earning a degree in Industrial Technology from Illinois State University. Since becoming a full-time employee in 1993, he has held many different roles, primarily assisting in the development and expansion of Sentinel’s many offerings and partnerships. Bob has earned many industry certifications and accolades for his focus and vision in technology and sales, and regularly provides strategic counsel to Sentinel’s partners.
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).