[1] At 41, he took over as chairman of Sonnenschein, making him the youngest partner to serve in the role and the first outside Chicago, where that firm was founded in 1906.
[2] Harvard Law School, J.D., cum laude, 1992Oxford University, Rhodes Scholar, Ph.D., 1986-1989Syracuse University, B.A., summa cum laude, 1986 Prior to assuming the Sonnenschein chairmanship, Portnoy was chair of the firm's Public Law & Policy Strategies Group, which he founded in 2002.
In April 2015, Dentons US agreed to a merger with Atlanta-based law firm McKenna Long & Aldridge, which was completed in June of that year.
[9] He was also recognized as one of the nation's top lobbyists by Washingtonian magazine, which also credited him for the growth of Sonnenschein's lobbying practice.
[16] In April 2019, Portnoy joined the Board of Directors of Catalyst,[17] a global non-profit working with some of the world's most influential business leaders and companies committed to advancing and progressing women in the workplace.