Markus Greiner is a German physicist and Professor of Physics at Harvard University.
Greiner studied under the Nobel Laureate Theodor Hänsch at the Ludwig-Maximilians University and at the Max-Planck-Institute of Quantum Optics, where he received his diploma and PhD in physics for experimental work on Bose-Einstein condensates and bosons in optical lattices.
He was involved in the first realization of the quantum phase transition from a superfluid to Mott insulator in a Bose-Hubbard system.
[1] He then moved to the United States and conducted postdoctoral research at JILA under Deborah Jin, working on the creation of a fermionic condensate of ultracold atoms.
Since 2005 Greiner has been a professor at Harvard University, continuing research on BECs and ultracold Fermi gases.