Diane Cullinan Oberhelman

Diane Cullinan Oberhelman

Chairman/Founding Partner

Diane founded Cullinan Properties in 1988 after being in the real estate business since 1981. Diane is known in the industry to pay particular attention to projects by being personally involved from inception to completion. Her vision and commitment led to one of Cullinan’s most notable projects, Grand Prairie Developments, which began as farmland and has since led to thousands of acres of multi-family, residential, entertainment, office and hospitality uses. Today, Diane is nationally regarded as a visionary and passionate business owner and continues to be a leader in real estate development industry.

Diane’s leadership and board affiliations are numerous and have included the Federal Reserve Advisory Council of Chicago, Illinois Economic Development Board, Ducks Unlimited Board, Kids Konnected Board, Multi-Ad Services, Inc. Board, Peoria Civic Center Authority Board, Susan G. Komen Board, OSF Foundation Board and chairman of the Salvation Army Tree of Lights Campaign and Illinois Development Finance Authority.

Diane’s awards and recognitions include being inducted into Midwest Real Estate News’ Commercial Real Estate Hall of Fame; honored as a 40 Leaders Under Forty Alumnus of the Year; induction into Junior Achievement’s Central Illinois Business Hall of Fame; Boy Scout Distinguished Citizen of the Year Award for Central Illinois; Central Illinois Volunteer of the Year Award; being named one of the 25 Women In Leadership; and receiving the Illinois Chamber of Commerce Athena Award.

Diane is married to Doug Oberhelman and has four grown children: Kathleen Cullinan Brill, Maureen Cullinan Bennett, Alison Cullinan Unkovich, and Allen Cullinan. Doug is the recently retired Chairman and CEO of Caterpillar Inc. They also have 11 grandchildren.