TLS, one page, 8.5 x 11, Cornell University Center for Radiophysics and Space Research letterhead, May 9, 1989. Letter to Gary John Gresl, president of Wisconsin Painters and Sculptors, Inc. In part: "Many thanks for your letter of April 15 and for the kind invitation to give a presentation as part of the Artist Forum Series at the Milwaukee Art Museum on the subject of fine art in science and/or science fiction. I am pleased by the invitation; however, my schedule for the foreseeable future has become so saturated by lecturing, writing, and research commitments that I have been forced to curtail the acceptance of further obligations." In fine condition.