PEI (Professional Education Institute) offer Business and Tax law courses for the public and Professional's for CE credit. Professional Education Institute (PEI) is an Arizona-based provider of IRS approved Leading-Edge Continuing Education --- PEI's current "spotlight" is on Tucson's Nationally-Recognized Tax Law Expert, David Randall Jenkins, Ph.D., and his Algorithm LLC, an IRS approved continuing education provider which is also registered with the National Association of State Boards of Accountancy (NASBA).