Professor and Associate Chair

610-758-3759

Ph.D., MIT, 1977

dlj0@lehigh.edu

## Interests:

Differential geometry, complex geometry, geometric measure theory

Fall 2018 Office Hours -- Monday & Friday 12:10pm-1:00pm and 3:10pm-4:00pm; Wednesday 12:10pm-1:00pm and 3:10pm-3:30pm

## Representative Publications:

Totally geodesic foliations, (with L. B. Whitt), J. Diff. Geo. 15 (1980), 225-235.
Volumes of flows, Proc. AMS 104 (1988), 923-931.
Some Sharp Isoperimetric Theorems for Riemannian Manifolds (with Frank Morgan). Indiana University Mathematics Journal, 49 (2000), 1017-1042.
Partial regularity of mass-minimizing rectifiable sections, (with Penny Smith), Annals of Global Analysis and Geometry 30 (2006), 239-287.
Chern-Simons forms on associated bundles, and boundary terms, Geometria Dedicata 120 (2007), 23-34.
Minimal surfaces in circle bundles over Riemann surfaces, (with P. Chacon), Bull. London Math. Soc., 43(1) (2011), 33-43.

Fall 2018 Courses Taught -- Math 21, Sections 310-313 - Calculus I; Math 208 - Complex Variables; Math 423 - Differential Geometry I