M
- Malcolm A. H. MacCallum (non-tilted spatially homogeneous cosmologies, exact solutions book),
- M. Mathisson (Mathisson–Dixon–Papapetrou equations, Mathisson–Pirnai condition in the Kerr metric),
- Richard A. Matzner (popularized Penrose picture of gravitational wave, rotating cosmologies),
- Marc Mars (Mars vacuum),
- David Maxwell (Yamabe number criterion for existence of asymptotically flat vacuum solutions),
- R. G. McLenaghan (CM invariants),
- Reinhard Meinel (Neugebauer/Meinel dust disk solution),
- M. A. Melvin (Melvin electrovacuum),
- A.W.K. Metzner (Gravitational waves, Bondi–Metzner–Sachs Group)
- Hermann Minkowski (spacetime),
- Charles W. Misner (mixmaster model, ADM initial value formulation, ADM mass, textbook)
- John Moffat (various classical gravitation theories)
- Vincent Moncrief (global properties of spatially compact dynamical vacuum spacetimes),
- C. Møller (energy-momentum complex),
- Moustafa Mosharafa (Relation of radiation, mass and energy),
Read more about this topic: Contributors To General Relativity