The purpose of this two day seminar is to review the state-of-the-art and the recent substantial progress in High Temperature Electronics and Instrumentation. This seminar comes at a critical time and it addresses a vital subject. The frontiers of technology are rapidly moving beyond the conventional 125°C boundary. Already, special “hostile environment" instruments routinely operate up to 180 C1 , a few prototype systems have been field tested to 275°C, new development is underway for 300°C integrated circuits 3, and research continues on components up to 500°C