 His expertise in witness description drawing, skull reconstruction, skull tracing, age progression, soft tissue postmortem drawing and restoration of photographs and videos have aided law enforcement agencies both nationally and internationally.Pratt also assists investigations through training classes, besides lecturing before universities, colleges, schools and civic groups.In the early 2000s Pratt teamed up with David Paulides in researching Bigfoot on the Hoopa Reservation in California, as well as in his home state of Oklahoma.