Jerry, Studies are presently underway at the Clark Institute in Toronto at the Anxiety Disorders' Clinic with respect to a possible link with PD to Obssesive-Compulsive disorder which sometimes resembles Tourettes. Also, there is a Tourette Syndrome Foundation in Canada which can be reached by fax at 416-351-9267. A prominent surgeon in Vancouver has had TS since he was very young. By the way, he is also a pilot and married and has children. Hope this helps! Sandra