William F. DeYoung

Of Counsel

P 312 855 5443 F 312 444 9027

Practice areas

William DeYoung is a litigator who focuses his practice in aviation, products liability and insurance coverage. He currently leads the firm’s Aviation Litigation & Transactions practice group.


Bill has extensive experience in aviation law, including the defense of airlines, aircraft operators, airframe manufacturers, and aircraft engine and component-part manufacturers, including aviation disaster litigation. Bill has particular experience in mass casualty aviation disasters in which foreign plaintiffs attempt to assert claims in the United States. Representations include acting as lead counsel representing engine and avionics manufacturers in multiple-forum aviation disaster litigation with multiple plaintiffs and foreign carriers. Bill also regularly represents aircraft owners, operators, pilots and FBO’s in a wide array of aviation-related disputes.

In addition to his aviation practice, Bill represents clients in the consumer home, medical, industrial and automotive industries in products liability matters.

Bill represents clients in litigation throughout the United States in both the State and Federal courts. He tries cases in both venues and handles state and federal appeals.

Bill has extensive experience in insurance coverage matters, including arbitrating and litigating coverage disputes on behalf of individual, corporate and municipal policyholders, as well as insurers, including London based underwriters. He also counsels his corporate clients on comprehensive insurance coverage programs.

While Bill has defended his clients in an extraordinary number of trials in both the Circuit Court of Cook County and the U.S. District Court for the Northern District of Illinois, he has also represented his clients in aviation litigation throughout the United States.

In addition to serving as former leader of the Aviation practice group, Bill has been a repeated member of Chuhak & Tecson’s Compensation and Management Committees.

Bill has been a pilot for 45 years, served aboard the U.S.S. America while in the Navy, and is currently an ATP and CFI-AI-MEI. He has flown his Cessna 421B for 25 years.


University of Illinois College of Law, J.D., 1980
Northwestern University, 1977

Bar Admissions
Illinois, 1980
U.S. Court of Appeals, Seventh Circuit, 1980

Court Admissions
U.S. District Court, Northern District of Illinois, 1980
Arizona, 1985
U.S. District Court, District of Arizona, 1985
Trial Bar, Northern District of Illinois

Memberships & Associations
  • American Bar Association
  • Chicago Bar Association
  • Illinois State Bar Association
  • Leading Lawyer (2004 – 2024)
  • University of Illinois Law Review, Associate Editor (1979 to 1980)
  • University of Illinois College of Law Order of the Coif
  • AV Rated on Martindale-Hubbell

Bill DeYoung enjoys flying, being a pilot and loves and talks about his aviation practice.

As a pilot and former Navy jet mechanic, Bill DeYoung possesses intricate knowledge of aircraft and the aviation industry that gives him a leg up when litigating aviation cases.