• Professor, Northwestern University , 2004 - present

• Associate Professor, Northwestern University, 1994 – 2000
• Assistant Professor, Northwestern University, 1989 – 2004
• Post-doctoral fellow, Harvard University , 1985- 1989
• Ph. D. Biophysics, University of Cambridge , 1985
• B. Ss. Physics, Universidad Nacional Autónoma de México, 1981

• DND Board, NE CAT NIH Resource Advisory Committee, SSRL Scientific Advisory Committee

Interests

• Structure and function of DNA topoisomerases
• Structure, mechanism and evolution of catalytic RNA molecules
• Structural basis of spectrin flexibility and recognition
• Macromolecular crystallography
• Biophysical studies of biological macromolecules