A sixth-generation Tucsonan, Pat is a real estate and business attorney whose clients include homebuilders, commercial developers, ranchers, and businesses of all types. He is a partner in Rusing & Lopez, P.L.L.C. which he formed in 1992 with fellow Stanford Law School graduate Mick Rusing. He has practiced law in Arizona since 1981, and has been an associate professor at the University of Arizona Rogers College of Law, where he taught contracts, real estate transactions, and land use planning. He is an AV rated lawyer by Martindale and Hubble (its highest rating) and is listed in Best Lawyers in America and Southwest Super Lawyers.