Tetra Tech, Inc. announced the promotion of Dr. Leslie Shoemaker to President. In this role she will lead strategic planning and operating segments. Dr. Shoemaker joined Tetra Tech 28 years ago, and has held increasingly responsible positions including project manager, chief strategy officer, and most recently executive vice president and business segment president. Additionally, Mr. Derek Amidon has been promoted to lead the Commercial International Services Group (CIG), one of two business segments, in addition to his current role as President of the Commercial Account Management Division. Most recently he has led the successful integration of the acquisition of the United Kingdom based WYG.