Who is Marianne Williamson?

Marianne Williamson is running for President.
Who is she?
She is a motivational speaker, New York Times best-selling author, and one-time congressional candidate.
According to Business Insider, she has a substantial following.
Williamson, 66, is the 10th Democratic candidate to jump into the race.
She began speaking and writing self-help books rooted in New Age spirituality in Los Angeles in the 1980s.
She appeared on the stage for the first round of Democratic debates.