John Sprenzel

John B. Sprenzel is a seasoned legal professional currently serving as General Counsel at ISI - Installation Specialists, Inc. from August 2024. Prior experience includes over thirteen years as an Attorney at Law with The Winkler Group LLC, specializing in property tax assessment appeals, corporate and transactional law, business planning, commercial and industrial real estate, mechanics lien litigation, and probate/estate planning. John B. Sprenzel has held leadership roles in various legal associations, including Chair of the Real Estate Taxation Committee at The Chicago Bar Association and Chair of the Real Estate Committee at the Northwest Suburban Bar Association. Educational qualifications include a Juris Doctor from Mitchell Hamline School of Law and a Bachelor of Arts in Political Science and Legal Studies from the University of St. Thomas.