Management Team

Our leaders are passionate about helping your organization achieve new heights of success through innovative technology solutions

Brian Osborne

Brian Osborne

Co-President - Chief Sales and Marketing Officer
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. Named as Co-President in February of 2018.
Robert Keblusek

Robert Keblusek

Chief Innovation & Technology Officer

Dale Owens

Dale Owens

Executive Vice President of Sales

Mike Guy

Mike Guy

Vice President of Sales - Eastern Region

John Kyle

Vice President of Sales

Kevin Koski

Kevin Koski

Vice President of National Market Development


Timothy Hill

Timothy Hill

Co-President - 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. Named as Co-President in February of 2018.

Jessica Rimkus

Corporate Counsel

Mike Truesdale

Vice President of Distribution

Penny Clancy

Vice President of Human Resources

Michele Markowski

Vice President of Efficiency


Robert Lenartowicz

Robert Lenartowicz

Co-President - 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). Named as Co-President in February of 2018.

Ed Truesdale

Executive Vice President of Operations

Jon Rimkus

Vice President of Enterprise Tech Resources

Ryan Santry

Vice President of Enterprise Tech

Cassondra Taylor

Vice President of Compliance National IT Solutions

Dana Jones

Dana Jones

Vice President of National Solution Architecture