The Rev. Lawrence Biondi announced Saturday that he will step down as president of Saint Louis University once a new president is selected. Father Biondi has served as president for 25 years, but in the last year has been the subject of no confidence votes and considerable criticism from students and faculty members who have said he has ignored their concerns, and who have questioned his management decisions. Father Biondi and the board had until Saturday indicated no intent to change course. The university's announcement did not reference the recent controversies.