In the last decade (Jan 2013 – Dec 2023), stranding networks in the Mid-Atlantic Region documented deaths of 714 pinnipeds, 2501 small cetaceans, and 258 whales. In NY and NJ alone in the same decade, there were >150 large whales (including at least 83 humpback, 41 minke, 12 fin, 4 sperm, 2 North Atlantic right, 2 sei, and 1 blue whale) that either stranded deceased or died/were euthanized after stranding. These events have generally increased in recent years with 2023 having the highest number of large whale strandings in the last decade; this period also includes three active Unusual Mortality Events declared for large whales in this region. Diagnostic evaluation of stranded marine mammals provides critical information on causes of stranding and death and can provide valuable insight into population and ecosystem health. The goal of this proposal is to continue and expand upon our funded Prescott FY 2024 proposal to support marine mammal stranding diagnostic investigation in the Mid-Atlantic Region (NY to VA) and provide training opportunities for the next generation of stranding responders, veterinarians, and pathologists.