There is an interesting article on today's Chicago Post-Tribune website about a local podiatrist who was asked by the producers of MonsterQuest to examine castings of alleged sasquatch footprints.
Dr. Michael Nirenberg was asked by the producers of the History Channel's hit series to examine various castings taken in different areas and over a period of many years. To my knowledge, Dr. Nirenberg is the first podiatrist to examine plaster castings of alleged sasquatch footprints. You can read the entire article and get more details here. However, his opinion after examining the castings can be summed up in his statement, "I'm led to believe there is some sort of creature out there making these footprints."
Give the article a look. Dr. Nirenberg has some interesting things to say.