Research intersts:
Finite Group Theory
Selected publications:
 A grouptheoretic approach
to a family of 2local finite groups constructed by Levi and Oliver.
Ann. of Math. (2), 171 (2010), no. 2, 881–978,
(with M. Aschbacher).
 The linking systems of the
Solomon 2local finite groups are simply connected. Proc.
Lond. Math. Soc. (3) 97 (2008), no. 1,
209–238, (with Bob Oliver and S. Shpectorov).
 Quadratic pairs. J.
Algebra 277 (2004), no. 1, 36–72.
 Quadratic pairs without
components. J. Algebra 258 (2002), no. 2, 442–476.
 Quadratic action and the ${\scr P}(G,V)$
theorem
in arbitrary characteristic. J. Group Theory 2 (1999),
no. 1, 1–13.
 Locally nonspherical Artin
groups. J. Algebra 200 (1998), no. 1, 56–98.
 A convergence theorem for $\Lambda$
trees. J.
Algebra 200 (1998), no. 1, 32–55.
 Triangles of groups. Trans.
Amer. Math. Soc. 347 (1995), no. 11,
4533–4558.
 ${\bf
R}$
trees, small
cancellation, and convergence. Trans. Amer. Math. Soc.
347 (1995), no. 11,
4515–4531.
 $J$
modules for local $BN$
pairs. Proc.
London Math. Soc. (3) 63 (1991), no. 1,
69–112, (with A. Delgado).

