Dr. Quadrifoglio is an Assistant Professor in the Zachry Department of Civil Engineering Professor at Texas A&M University. On Friday, May 8, 2009, Dr. Quadrifoglio presented “Zoning Strategy Effect in ADA paratransit services: A Simulation Study in Los Angeles, CA” for Portland State Universityís Transportation Seminar Series. Dr. Quadrifoglio discussed paratransit demand responsive transit (DRT) complexity and routing strategies using a simulation model of the operations of DRT providers on a network based on data for DRT service in Los Angeles County . The appearance was made possible by OTRECís Visiting Scholars Program. For more information on Dr.Quadrifoglio’s research, visit his home page.