You could also talk to him on Twitter, if that's your preference: @thinkinpractice. (Thinking Practice is too many letters, it's not that a beat poetry affectation.)
For photos of books and art look at Mark's Instagram http://instagram.com/thinkingmark
Or send a postcard or a pigeon to
THINKING PRACTICE/ 9 Chestnut Road, Eaglescliffe, Stockton-on-Tees TS16 0BA.