sentences:  In 2002, Roland Kirstein visited the University of California, Berkeley (Law School, invited by Prof. Robert Cooter) and in Santa Barbara (Economics Department, invited by Prof. Ted Bergstrom) to do research into asymmetric information in consumer markets.Since 2003, he has been a visiting professor at the University of California, Santa Barbara, giving courses in Law and Economics.Since October 2006, he holds the professorship "Economics of Business and Law" at the Otto-von-Guericke-University Magdeburg.