A pleasure to be invited by Lisa Blackwell, granddaughter of Prof. David Blackwell, to say a few words about her grandfather at an event this afternoon to promote an upcoming documentary about his life.
To quote my colleague Mike Jordan, Blackwell's 'approachability' theory is "the basis of the entire online learning paradigm", and "it took many years for people in the online learning community to realize that David was basically the founder of their field".
For example, (Abernethy, Bartlett, Hazan '2011) showed that Blackwell's 'Approachability Theorem' is in fact equivalent to regret minimization for Online Linear Optimization; basically, Blackwell was just 50 years ahead of his time.