My photos have been with private collectors since 1981.
Most recently (2015) 11 prints have been added to the permanent collection of the Boston Athanaeum. This collection is described in this blog post. The collection at the Athenaeum is on their site here.
Three of the Athanaeum's photos are on display through the spring and summer in their show, in Boston: "New England on Paper: Contemporary Art in the Boston Athenæum's Prints & Photographs Collections." This is a really good show, well curated and full of good work. It is worth seeing! I feel proud to be in such good company.