John Byrnes spent decades building companies – his own and others’. After running the private equity group at Marshall & Ilsley bank for 15 years, he managed its spinout into a new private equity firm. Under John’s oversight, Mason Wells raised three funds, the last reaching $525 million. New Mason Wells leaders have gone on to raise a fourth, $615 million fund. As he built Mason Wells, John built a very successful track record helping more than 75 portfolio companies grow. John's experience