On March 8 2017, Prof. Shamgar Gurevich (UW-Madison) and his collaborator Prof. Roger Howe (Yale and Texas A&M) presented at a seminar talk at IAS - Princeton. Videos are now available here...
Their recent discovery of a notion of “size” for symmetries of spaces, and their new discovery called “eta correspondence” to describe explicitly “small" symmetries. In their research process, Gurevich and Howe benefit a lot from the work of Prof. John Cannon (Sydney) and Dr. Steve Goldstein (UW-Madison) who produced a lot of numerical data, leading to the discovery of the "eta correspondence”.
Update: Links to Videos.