Joining the Giving Pledge Share By Heising-Simons Foundation on 6/1/2016 on 6/1/2016 In 2016, Mark Heising and Liz Simons, founders of the Heising-Simons Foundation, announced their participation in the Giving Pledge. The Giving Pledge is a multi-generational, global initiative created by Warren Buffett and Bill and Melinda Gates that encourages the wealthiest families to give the majority of their wealth to philanthropic causes. The following is the letter …