When Peter J. Birnbaum was in law school, his friends didn’t understand the obsession he had with his job as a law clerk at Attorneys’ Title Guaranty Fund Inc. In 1981, the title insurance company had four people in its Chicago office and a few in Champaign. Birnbaum saw a company of committed staff and dedicated attorney members that was poised for growth. He never left, and now he serves as ATG’s president and CEO. “It’s been nothing but interesting and fun,” Birnbaum said …