Kai is a neuroscientist doing stem cell research Amelia and Meredith were both familiar with their work They met Meredith and Amelia when they came to Minnesota to hear David  pitch for them to work together to cure Parkinson's Disease Kai continued to work with Amelia after Amelia returned to Seattle using video calls to share research Kai then asked if Amelia could return to Minnesota soon to help them work out some kinks Amelia said she Kai and David flew to Seattle to do the surgery they/the