What is the fine-grained topic of the following text: Rounding out the team, Kim works closely with her boss and Markham President, Bryan Del Bondio, who cut his teeth alongside the valley's trailblazers in the 1970s, and has seen and played an integral part in the rise of Napa Valley to the upper echelons of the wine world. Only return the topic.
Kim's professional relationship with Markham President Bryan Del Bondio