Ackman is the founder and CEO of Perishing Square Capital Management, and has a net worth of more than $4 billion.

• He is considered by some to be a contrarian investor, but considers himself an "activist investor".

• Following the October 7 attack on Israel, Ackman became an outspoken opponent of various prestigious universities, alleging that they had becoming breeding grounds for anti-semitism and had been tarnished in their academic prestige.