The goal of the Howard Hughes Science Institute (HHMI) supported science program is to train one staff member to become a science lead within each of the elementary schools in the Montgomery County (Maryland) Public Schools (MCPS) district. The specific objectives of the first year of HHMI grant project were to: (1) provide approximately 20 teacher leaders with an increased understanding of targeted Next Generation Science Standards (NGSS) practices and the skills needed for them to create a training plan; and (2) to deliver this knowledge to 100 elementary classroom teachers during a week-long Science Summer Institute (SSI). This year 1 evaluation describes the implementation and impact on: (1) teacher leaders as they went through a series of professional development, including creating and implementing the Science Summer Institute (SSI) training for other elementary level teachers; and (2) elementary classroom teachers who attended the week-long SSI professional development. The evaluation includes three recommendations for improvement. The following are appended: (1) Science, Technology, and Engineering Montgomery County Public Schools. Trainer Application--2013-2015 School Years; (2) Second-Fifth Grade Science Summer Institute Overviews (June 23-27); and (3) Aspects that Hinder Effective Science Instructions Reported by SSI Participants.