Hello, my name is: Stephen C. Preston. For 2005-6, I'm a visiting assistant professor at Stony Brook University. Beginning in Fall 2006, I will be an assistant professor at University of Colorado at Boulder. Contact information: preston@math.sunysb.edu Math 4-111, (631) 632-8273 Department of Mathematics, Stony Brook, NY 11794-3651 Teaching: Fall 2005: Math 517 Spring 2005: Math 131 and Math 351

• `Eulerian and Lagrangian stability of fluid motions,' doctoral dissertation.
• `For ideal fluids, Eulerian and Lagrangian instabilities are equivalent,' GAFA, volume 14, no. 5.
• `Nonpositive curvature on the area-preserving diffeomorphism group,' J. Geom. Phys., volume 53, no. 2.
• `Singularities of the exponential map on the volume-preserving diffeomorphism group,' with David G. Ebin and Gerard Misiolek, to appear in GAFA.
• `On the volumorphism group, the first conjugate point is always the hardest,' to appear in Comm. Math. Phys.

Talks:

• A survey of geometrical methods in ideal fluid mechanics
• Conjugate points on the volumorphism group, and a Jacobi field picture.

• Late-90s articles for the Stony Brook Press
• Fall 2002 columns for the Daily Pennsylvanian

Anca Rădulescu.