Michael J. Hogan, whose leadership style and policies as president of the University of Illinois were criticized by many faculty members, has resigned, the chairman of the system's Board of Trustees announced on Thursday.

In a written statement, the chairman, Christopher G. Kennedy, said that Mr. Hogan, who has been president for less than two years, would remain in office "through a transition period" until July 1. He will then serve as a tenured faculty member, the university said. Mr. Hogan, a historian, would be replaced permanently, Mr. Kennedy wrote, by Robert Easter, who is interim vice chancellor for research on the flagship campus, in Urbana-Champaign, and has served in a number of leadership roles throughout the system.

"The board feels that the most appropriate next step in univer­sity leadership should come from a proven administrator with a track record of collaboration and success within our university," the chairman wrote....