Professor Spak received his master of laws degree from Northwestern University School of Law, where he was a Ford Foundation Fellow, and his bachelor's and law degrees from DePaul University, where he served as associate editor of the DePaul Law Review. He was admitted to practice in both Illinois and Michigan in 1961.

Professor Spak served on active duty with the U.S. Army in the Judge Advocate General's Corps from 1963 to 1969 and has remained in the U.S. Army Reserves. As Colonel Spak, he is currently liaison officer of the Judge Advocate General's School, Charlottesville, Virginia, for a seven-state area.

Professor Spak was professor of law at DePaul University from 1969 to 1974 and joined Chicago-Kent as a professor in 1974. He has also taught at St. Louis University and the University of Maryland.

Professor Spak is the author of six books, Cases and Material on Military Law, Cases and Materials on Military Justice, Electronic Cases and Materials on Sales and Secured Transactions, Electronic Cases and Materials on Commercial Paper, Electronic Cases and Materials on a Survey of Commercial Law and Faulkner and Gray's Comprehensive Guide to Electronic Health Records as well as more than four dozen law review articles.

Professor Spak has been professor-reporter on the Uniform Commercial Code Committee, Illinois Judicial Conference, and is also the professor-reporter in the Living Legends of the Law Series for Contracts, Sales (Art. 2, UCC), Secured Transactions (Art. 9, UCC), and Commercial Paper (Art. 3, UCC). He teaches courses in the commercial law area at the law school.