Two Degrees of Separation (from me) by PotatoD

Question 11

I once took my daughter to a playdate at the home of a preschool classmate, who was the niece of this award-winning playwright and screenwriter, making me connected to him by two degrees of separation. The classmate's mom (the playwright's sister) was a lawyer whose time in the Judge Advocate General corps inspired her brother's first big hit. Name the playwright/screenwriter.

Aaron Sorkin