 On returning to Chicago to resume full-time duties at Quaker he also taught after hours at the Wharton School of Finance, University of Pennsylvania; the Kellogg School, Northwestern University; Loyola University of Chicago; DePaul University; the University of Illinois-Chicago and Saint John's College, Oxford.In addition, while continuing his work at Quaker, he became an op-ed writer for "The Chicago Sun-Times", following which he wrote for "The Chicago Tribune" and wrote op-eds for The Wall Street Journal.Long active in Chicago civic, religious and political life, Roeser was a founder of Project LEAP (Legal Elections in All Precincts), the city's anti-vote-fraud organization, was president of the City Club of Chicago for seventeen years and its chairman; was chairman, founder of the Republican Assembly of Illinois, an organization of grassroots conservative Republicans, and a co-founder of Catholic Citizens of Illinois.