theoretician

n.

精通于理论的人，理论家；

复数：theoreticians

1. Zhu Guangqian is a famous esthetician and literature theoretician.
   朱光潜是我国著名的美学家、文学理论家。
2. The problem is, the theoretician does not know a thing about software development.
   问题在于，理论家根本就不知道什么叫软件开发。

Boron: Elementary Challenge for Experimenters and Theoreticians
The lazy model-theoretician''s guide to stability
Invited talk: automata theory for database theoreticians
Turnable formalism in object-oriented systems analysis: meeting the needs of both theoreticians and practitioners
THE EYE AS A THEORETICIAN: SEEING STRUCTURES IN GENERALIZING ACTIVITIES
[Outstanding theoretician and organizer of Soviet public health on the centenary of the birth of Z. P. Solov'ev)]
Encyclopedia of postcolonial studies /
The EM Algorithm and Extensions
Learning and Teaching Styles in Engineering Education.
Constructing validity: Basic issues in objective scale development.