Kellerman is retiring from John Graham Thu, 01/07/2021 - 3:32pm meganj PETER KELLERMAN IS leaving the top administrative post at Vergennes-based John Graham Housing & Services after leading the nonprofit through seven eventful years. Photo courtesy Peter Kellerman The full text of this article is only available to online subscribers. Are you an online subscriber? Login using the form below. Click here to learn more about our subscription options. If you have a print subscription, you can now add an online subscription at no additional charge! Just email us with your name and mailing address to set it up.