(Ecotourism.org) The International Ecotourism Society (TIES) has revised its Definition and Principles, created by the founding members in 1990. Leading up to the 25 year anniversary celebration in 2015, ecotourism experts from around the world connected to re-evaluate TIES principles of ecotourism as an initiative led by Hitesh Mehta, Judy Kepher-Gona, and Dr. Kelly Bricker.