The third speaker is a hard-core researcher, publishes a lot: https://www.theorie.physik.uni-muenchen.de/lsluest/oriti_group/members/group-leader/oriti/index.html

"quantum gravity (particularly on tensorial group field theories (group field theories, random tensor models), loop quantum gravity, spin foam models, lattice quantum gravity, non-commutative geometry), gravitational physics, fundamental cosmology; wider research activities in philosophy of science and foundations of physical theories, in particular foundations of quantum mechanics and philosophy of spacetime theories"