On the singularities and radial injectivity of Riemannian exponential maps, joint with Keith Burns , In preparation.
CROSS blocked manifolds are Blaschke, joint with Keith Burns , In preparation.
Closed geodesics without proper chords, joint with Keith Burns , In preparation.
Three-manifolds with constant vector curvature, joint with Jon Wolfson , Submitted.
Positively curved manifolds with large conjugate radius, Submitted.
Two remarks on the length spectrum of a Riemannian manifold, joint with Craig Sutton , Proc. Amer. Math. Soc., 139 (2011), 4113-4119.
Spherical points in Riemannian manifolds, Proc. Amer. Math. Soc., 139 (2011), 305-308.
A characterization of round spheres in terms of blocking light, joint with Juan Souto , Commentarii Mathematici Helvetici, 85 (2010), 259-271.
The three gap theorem and Riemannian geometry, joint with Ian Biringer, Geometria Dedicata, 136 (2008), no.1, 175-190.
Maximal ball packings of symplectic-toric manifolds, joint with Alvaro Pelayo , International Mathematics Research Notices (2008) Vol. 2008, ID rnm139, 24 pgs.
Blocking light in compact Riemannian manifolds, joint with Jean Lafont , Geometry and Topology, 11 (2007), pgs.771-780.
On submanifolds in locally symmetric spaces of non-compact type, joint with Jean Lafont , Algebraic and Geometric Topology, 6 (2006), pgs.2455-2472.
Simplicial volume of closed locally symmetric spaces of non-compact type, joint with Jean Lafont , Acta Mathematica, 197 (2006), pgs.129-143.
Weakly hyperbolic actions of Kazhdan groups on tori, Geometric and Functional Analysis, 16 (2006), no. 5, pgs.1139-1156.
Blocking light in closed Riemannian manifolds, Guido's Book of Conjectures, Monographie de L'Enseignement Mathematique, 40 (2008), pgs. 165-167.
Weakly hyperbolic group actions , PhD thesis, University of Michigan (2006).