Ullom, Stephen V.  
   University of Illinois at Urbana-Champaign. Algebraic Number Theory, Galois Module Structure.
   http://www.math.uiuc.edu/~ullom/

Ulmer, Douglas  
   University of Arizona. Director of the Southwestern Center for Arithmetical Algebraic Geometry.
   http://math.arizona.edu/~ulmer/

Urban, Eric  
   University of California Los Angeles. Automorphic forms and number theory.
   http://www.math.ucla.edu/faculty/urban.html

Ueda, Masaru N.  
   Nara Women's University. Modular forms. Papers, preprints.
   http://sphinx.math.nara-wu.ac.jp/~ueda/index_e.html

Umegaki, Atsuki  
   Sophia University. Arithmetic of elliptic curves. Papers, CV.
   http://www.mm.sophia.ac.jp/~umegaki/