Irreducible subgroups of exceptional algebraic groups, Memoirs Amer. Math. Soc., 390, (1988), 1–190.
A1–type overgroups of elements of order p in semisimple algebraic groups and the associated finite groups, J. of Algebra 177 (1), (1995), 34–76.
Nilpotent centralizers and Springer isomorphisms, with G.J. McNinch, Journal of Pure and Applied Algebra, 213 (7), (2009), 1346-1363.
Centres of centralizers of unipotent elements in simple algebraic groups, with Ross Lawther, Mem. Amer. Math. Soc., 210 (2011), no. 988, 1-188.
Linear Algebraic Groups and Finite Groups of Lie Type, with Gunter Malle, Cambridge studies in advances mathematics, 133, (2011), xiv+309 pp.
Irreducibility in algebraic groups and regular unipotent elements, with Alexandre Zalesski, Proc. Amer. Math. Soc.,141 (2013), no.1, 13–28.
On the irreducibility of symmetrizations of cross-characteristic representations of finite classical groups, with Kay Magaard and Gerhard Röhrle, J. Pure Appl. Algebra, 217 (2013), no. 8, 1427-1446.
Irreducible almost simple subgroups of classical algebraic groups, with Timothy Burness, Soumaïa Ghandour and Claude Marion, Mem. Amer. Math. Soc., 236, (2015) 110 pp.
A1-type subgroups containing regular unipotent elements, with T.C. Burness, Forum of Mathematics, Sigma, 7 (2019), 61 pp.
A new family of irreducible subgroups of the orthogonal algebraic groups, with Mikaël Cavallin, Transactions of the American Mathematical Society, Series B, 6, (2019), 45–79.