Obagi Medical Products, Inc. announced today that president and chief executive officer Steven R. Carlson has resigned, effective immediately, from those posts and from the company’s board of directors. Albert F. Hummel, a director who has been with the company since 2005, has been appointed as interim president and chief executive officer. “The board thanks Steve Carlson for his more than five years of service, during which time the Company completed its successful initial public offering, d...