Ed.D. (ABD), Mathematics Education, University of Alabama, May 2010 (Expected).

Ph. D., Mathematics, University of Alabama, August 2005.

M.A., Mathematics, University of Alabama, August 2003.

M.Ed., Mathematics Education, Korea National University of Education, February 2000.

B.Ed., Mathematics Education, Korea National University of Education, February 1992.

Geometric Group Theory: Generalization of hyperbolic groups, Loop shortening property, L-delta groups, Automatic groups, CAT(0) groups, Median groups
Mathematics Education: Mathematics teacher education, Mathematics teaching efficacy, Mathematics teacher knowledge, Lesson study

Ryang, D. (2009). Attitudes toward mathematics and mathematics self-efficacy on a learning community model: A case study, Research in Mathematical Education, 13, 109-122.
 
Corson, J., Brick, S., & Ryang, D. (2008), A Quasi-isometry invariant loop shortening property for groups, International Journal of Algebra and Computation, 18, 243-257.

Ryang, D. (2008). Finite extensions of weighted word L-delta groups, The Pure and Applied Mathematics, 15, 353-364.

Corson, J., & Ryang, D. (2007). Isoperimetric functions of groups acting on L-delta metric spaces, Glasgow Mathematical Journal, 44, 1-6.

Ryang, D. (2007). Reliability and validity of Mathematics Teaching Efficacy Beliefs Instrument among Korean pre-service mathematics teachers, The Mathematical Education, 46 (2007), 263-273.

Ryang, D., & Corson, J. (2006). Direct product of L-delta groups, The Pure and Applied Mathematics: Journal of Korean Society of Mathematical Education (KSME) Series B, 13 (2006), 269-280.