Tim focuses purely on tenant and corporate representation. He graduated from the University of Notre Dame in 1995 where he majored in Marketing and received a B.A. in Business Administration. He joined CBRE in June, 1995, & began practicing commercial brokerage. Tim was a founding Principal of local brokerage boutique, RESOURCE Commercial Real Estate in 2005. After being named President in 2007, he grew the firm & successfully led the effort to affiliate with & subsequently integrate with Colliers International.

Early in his career Tim earned the prestigious CCIM and SIOR designations. In fact, at the time he achieved his SIOR designation in 2000, Tim was the youngest broker nationwide to have earned both designations. He later added the LEED accreditation. Tim was awarded the Broker of the Year by the local BOMA chapter in 2000, was named REALTOR of the Year by the Indiana Commercial Board of REALTORS in 2006, & was the award winner for Junior Achievement of Central Indiana's Indy's Best & Brightest - Real Estate, Development & Construction category in 2005.

Tim founded O'Brien Commercial Real Estate in 2013, and joined Cresa in 2019. He specializes in tenant representation and multi-market corporate services, representing users (or "occupiers") of commercial real estate on a local, regional, and national basis.