theorist

[thee-er-ist, theer-]
noun
1.
a person who theorizes.
2.
a person who deals mainly with the theory of a subject: a theorist in medical research.

Origin:
1585–95; theor(y) + -ist

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
theorist (ˈθɪəˌrɪst)
 
n
the originator of a theory; a person who is concerned with theory; a theoretician

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
He has suffered from his great reputation as a critic and theorist, from the
  effects of his intelligence.
Every so often, a music theorist tries to determine what late works have in
  common, with interesting but murky results.
He appears to be a loner and conspiracy theorist of a vaguely right-wing
  variety.
Our reviewer, a leading business theorist and management consultant, strongly
  disagrees.
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