Welcome to the ISEI 2012 which is being held at the Ritz Carlton hotel in sunny San Juan, Puerto Rico from June 10-13, 2012 sponsored by the IEEE Dielectrics and Electrical Insulation Society (DEIS). This is the 19th biennial conference in the series that began in 1976. The aim of the founders of the ISEI was to have a conference that would be held in North America, yet attract a large percentage of attendees from outside North America....