A history of central sets (to appear in Ergodic Theory and Dynamical Systems)

Notions of size in a semigroup -- an update from a historical perspective (to appear in Semigroup Forum)

The research of seven students at Howard University (to appear in Contemporary Mathematics)

(With W. Brian) Factoring a minimal ultrafilter into a thick part and a syndetic part

(With D. Strauss and L. Zamboni) Combining extensions of the Hales-Jewett Theorem with Ramsey Theory in other structures

(With K. Pleasant) Central Sets Theorem for arbitrary adequate partial semigroups

(With D. Strauss) Some new results about the ubiquitous semigroup H