john joseph ricketts (born july 16, 1941) is an american businessman and philanthropist. he is the founder, former ceo and former chairman of td ameritrade. he had a net worth of us$2.7 billion as of 2019 according to "forbes". ricketts also engages in philanthropy through the ricketts art foundation, opportunity education foundation, the cloisters on the platte foundation, and the ricketts conservation foundation.