The start of a new school year is a challenging and exciting time for any teacher—and a time when beginning teachers particularly need our support. Working with new science teachers in the New Science Teachers’ Support Network (NSTSN) has shown the authors that veteran teachers have the greatest impact on beginning teacher’s success. The NSTSN is a federal research study of 59 new science teachers employed full-time across 3 school districts and 35 schools. Based on the study’s observation reports and survey responses—from new science teachers enrolled in NSTSN and the experienced teachers assigned to support them—they have arrived at the following suggestions to help experienced science teachers assist new teachers.