theorist

Meanings

1. 1
   noun

   Someone who constructs theories, especially in the arts or sciences.

   Some of the most beautiful and thus appealing physical theories, including quantum electrodynamics and quantum gravity, have been dogged for decades by infinities that erupt when theorists try to prod their calculations into new domains.

2. 2
   noun

   someone who theorizes (especially in science or art)

Etymology

From theory + -ist.