Tim Keller serves as the Institute for Justice Arizona Chapter's executive director.  He joined the Institute as a staff attorney in August 2001 and litigates property rights, school choice and other constitutional cases in state court.

Tim successfully defended Mesa brake shop owner Randy Bailey, when the City sought to take his property through eminent domain so it could hand it over to the owner of an Ace hardware store.  He also helped author Arizona’s landmark property rights protection initiative, Proposition 207.  He is currently defending Arizona’s scholarship tax credit programs in state and federal court and he is also litigating to protect Arizona’s tuition grant programs for children with disabilities and children in foster care in state court.

In addition to his victories in court, Tim has earned a remarkable string of victories in the court of public opinion, challenging bureaucrats and forcing them to back down.  Among these examples is his work on behalf of Christian Alf, a teenager from Tempe, Ariz., who sought to help senior citizens rat-proof their home by bending wire mesh around any openings.  Until Tim stepped in on Alf's behalf, an Arizona state agency had demanded the young entrepreneur secure an exterminator's license.

Tim is the author of Policing and Prosecuting for Profit: Arizona’s Civil Asset Forfeiture Laws Violate Basic Due Process Protections.  He received his law degree from Arizona State University where he was the president of the Arizona State Federalist Society chapter and a member of the National Moot Court team.  Before that, he earned his bachelor's degree in Economics from Arizona State University, graduating magna cum laude.  Prior to starting law school, Tim worked as a research assistant at the Goldwater Institute, a state-based free market public policy organization.

Upon graduation from law school, Tim clerked for the then Presiding Judge of the Maricopa County Superior Court, Robert D. Myers.  After leaving the Superior Court, Tim accepted a clerkship with the Honorable Ann A. Scott Timmer on the Arizona Court of Appeals.  Tim and his wife Lisa have four sons, Daniel, Benjamin, Ethan, and Noah.