Pittsburgh-based photographer Mark Perrott has spent the last four decades documenting the ever-growing tattoo culture in America. Now the Silver Eye Center for Photography will host a talk and signing event for Perrott's most recent book Tattoo Witness, a collection of intimate portraits of tattooed subjects. In addition to the images, the 135-page hardbound work includes a forward by Linda Benedict-Jones, Carnegie Museum of Art's first photography curator, and excerpts from interviews conducted by Tim Azinger and Heather Mull.