  My collaboration and friendship with John Bell is recollected. I will explain
his outstanding contributions in particle physics, in accelerator physics, and
his joint work with Mary Bell. Mary's work in accelerator physics is also
summarized. I recall our quantum debates, mention some personal reminiscences,
and give my personal view on Bell's fundamental work on quantum theory, in
particular, on the concept of contextuality and nonlocality of quantum physics.
Finally, I describe the huge influence Bell had on my own work, in particular
on entanglement and Bell inequalities in particle physics and their
experimental verification, and on mathematical physics, where some geometric
aspects of the quantum states are illustrated.
