Based on the passage provided, what does Brene Brown's research focus on?

Casandra Brené Brown (born November 18, 1965) is an American professor, lecturer, author, and podcast host. Brown is known in particular for her research on shame, vulnerability, and leadership, and for her widely viewed TEDx talk in 2010. Since then she has written six number-one New York Times bestselling books, hosts two podcasts, and has filmed a lecture for Netflix as well as a series about her latest book, Atlas of the Heart on HBO Max.

Brene Brown's research focuses on shame, vulnerability, and leadership.