theoretician

theoretic +‎ -ician

theoretician (plural theoreticians)

1. Someone who is expert in the theory of a particular science or art.
2. A theorist.
   • 2013 December 10, Ron Cowen, “Simulations back up theory that Universe is a hologram”, in Nature News‎, retrieved 2014-04-27:

     “They have numerically confirmed, perhaps for the first time, something we were fairly sure had to be true, but was still a conjecture — namely that the thermodynamics of certain black holes can be reproduced from a lower-dimensional universe,” says Leonard Susskind, a theoretical physicist at Stanford University in California who was among the first theoreticians to explore the idea of holographic universes.

• “theoretician”, in OneLook Dictionary Search.

• heretication