Who had Tina Tchen as a Chief of Staff and started her early legal career working at the law firm Sidley Austin?
Tina Tchen:  From 2011 until 2017, she served as Assistant to President Barack Obama; Chief of Staff to First Lady Michelle Obama; and Executive Director of the White House Council on Women and Girls. Michelle Obama:  Raised on the South Side of Chicago, Illinois, Obama is a graduate of Princeton University and Harvard Law School, and spent her early legal career working at the law firm Sidley Austin, where she met her husband.
Michelle Obama