 The Amazing Randi, Dietrich, Penn & Teller and Dick Brookz are magicians that have exposed these unscrupulous mediums.According to Dietrich, mediums are thriving today in the U.S. and Europe.Dietrich doesn't mince her words in her criticism of "psychics" Sylvia Brown, Lisa Williams and John Edward, who she cites as examples of mediums that are taking advantage of grieving people who are seeking to communicate one last time with their deceased loved one ... "We had a man come into our museum not long ago who had been to a phony medium," said Dietrich.