HOWARD J. TRIENENS is a partner of Sidley and former chair of Sidley’s Executive Committee. His practice has been primarily corporate and litigation before courts and administrative agencies in antitrust, regulatory and other matters. He joined the firm as an associate in 1949. From 1950–1952, he served as law clerk to Chief Justice Vinson of the Supreme Court of the United States. He returned to the firm in 1952 and has been a partner since 1956. Mr. Trienens also became Vice President and General Counsel of AT&T in 1980 and retired as Senior Vice President and General Counsel in 1986. In announcing his retirement, AT&T stated that Mr. Trienens had played “a key role in disposing of antitrust litigation that developed in the wake of government policies that introduced competition into the telecommunications industry. He also was deeply involved in the restructuring of the Bell System and AT&T following the settlement of the Department of Justice suit.” Mr. Trienens has served as a Director of R. R. Donnelley & Sons Co. and G. D. Searle & Co., and was Counsel to Northwest Industries and Lone Star Technologies, Inc.

Partner
Howard J. Trienens
Experience
- Memberships and Activities
- Past Chairman of the Board of Trustees of Northwestern University, 1986–1995
- Trustee of Northwestern, 1967–Present
- American Bar Association
- Illinois Bar Association
- Chicago Bar Association
- New York Bar Association
- American College of Trial Lawyers
Credentials
Admissions & Certifications
- U.S. Court of Appeals, 2nd Circuit
- U.S. Court of Appeals, 3rd Circuit
- U.S. Court of Appeals, 5th Circuit
- U.S. Court of Appeals, 7th Circuit
- U.S. Court of Appeals, 10th Circuit
- U.S. Court of Appeals, 11th Circuit
- U.S. Court of Appeals, D.C. Circuit
- U.S. District Court, E.D. of New York
- U.S. District Court, S.D. of New York
- New York
- Illinois (Retired)
Education
- Northwestern School of Law, J.D., 1949 (magna cum laude, Order of the Coif)
- Northwestern University, B.S., 1945
Clerkships
- Fred M. Vinson, United States Supreme Court (1950 - 1952)