During my three-month sabbatical in New York, hosted by the Italian Academy of Advanced Studies in America and the Center for Theoretical Physics at Columbia University, I had the privilege to visit several US institutions and to meet tens of outstanding colleagues, including many students and young researchers. It was also a great opportunity to catch up with friends and collaborators, and to present the research work that we carry out in my group in Amsterdam.

Here are the videos of two key presentations:

• Yale: This colloquium given at the Department of Physics at Yale University is representative of the ones I gave at Columbia, MIT, and Stony Brook.

• Harvard: This shorter presentation given at the Institute for Theory and Computation, Center for Astrophysics is similar to those I gave at the Center for Computational Astrophysics (CCA) and the BHs Conference at the Bahamas