I  am an associate professor in the mathematics department at the University at Buffalo, SUNY.  My office is 211 in the mathematics buildling and my office phone is 716-645-6284 x 137.

Previous to coming to Buffalo I was an associate professor at the University of Toledo mathematics department .

Before that I was an NSF postdoctoral fellow at the University of Georgia math department .  My senior scientist and collaborator was Professor  Dan Nakano .

Snail mail:      
        244 Mathematics Building
        Buffalo, NY  14260-2900.  

Spring 2009 Office Hours:  Tues 10-11, Wed 9-11, Thur 3:20-4:00 and by appt..                   
                        

Email me:  dhemmer@math.buffalo.edu                                

In  2001 I  completed my Ph.D at the University of Chicago math department , working under the supervision of Professor  Jon Alperin .  My research focuses on the modular representation theory of symmetric and general linear groups.

My CV:   Here is my CV as of March 2009.

My Research:
           
            Here is a  research statement  designed for those in my field.

            Here is a research statement designed to be accessible to undergraduate math majors.                                 

Publications:

• "The Ext¹  quiver for completely splittable representations of the symmetric group,"  Journal of Group Theory, (4)   (2001) #4, p. 401-416. pdf    dvi ps
• "Support varieties for modules over symmetric groups," (With Dan Nakano) Journal of Algebra, (254) (2002), p. 422-440. pdf
  
• "Specht filtrations for Hecke algebras of type A," (With Dan Nakano),  J. London Math Society (2) (69) (2004), p. 623-638. pdf
  
• "Fixed-point functors  for symmetric groups and Schur algebras," J. Algebra (280) (2004), p. 295-312.  pdf
• "A row removal theorem for the Ext^1 quiver of symmetric groups and Schur algebras,"  Proc. American Mathematical Society, ( 133)  (2005), p.403-414.   dvi     pdf
• "Representation Type of Schur Superalgebras," (With Kujawa and Nakano), J. Group Theory, (9) (2006) #3, p. 283-306.   pdf   ps
• "Irreducible Specht modules are signed Young modules," J. Algebra (305) (2006) , p.433-441  pdf
• "Cohomology of Specht modules," (with Nakano) J. Algebra (306)  (2006), p. 191-200.   pdf
  
• "Symmetric Group Modules with Specht and Dual Specht Filtrations," Communications in Algebra, 35:11, (2007) 3292 - 3306  pdf
  
• "The group of endotrivial modules for the symmetric and alternating groups," (With Jon Carlson and Nadia Mazza), to appear , Proc. Edin. Math. Soc. 2009.  pdf
• "The complexity of certain Specht modules for the symmetric group," to appear, Journal of Algebraic Combinatorics, 2009.  pdf
• "Cohomology and generic cohomology of Specht modules for the symmetric group," to appear, J. Algebra 2009. pdf
• "On the cohomology of Young modules for the symmetric group," (With Fred Cohen and Dan Nakano), submiited 2009.   pdf

• My doctoral disseration (final version! 6/01)  dvi ps

• American Contract Bridge League
• AMS Math on the Web
  
• Groups, Representations and Cohomology Preprint Archive
  
• Drudge Report