John Duskin is a category theorist from the North American School of Category Theory in the Buffalo group. He is often refered to as Jack Duskin.
J. Duskin, 1975, Simplicial methods and the interpretation of “triple” cohomology , number 163 in Mem. Amer. Math. Soc., 3, Amer. Math. Soc.
J. Duskin, 1979, Higher-dimensional torsors and the cohomology of topoi: the abelian theory , in Applications of Sheaves , number 753 in Lecture Notes in Maths., Springer-Verlag.
John Duskin, The Azumaya complex of a commutative ring, in: Categorical algebra and its applications (Louvain-La-Neuve, 1987), 107–117, Lecture Notes in Math. 1348, Springer 1988.
J. Duskin, An outline of a theory of higher dimensional descent , Bull. de la Soc. Math. de Belgique, 41, (1989), 249 – 277.
M. Bullejos, A. M. Cegarra and J. Duskin, On cat$^n$ -groups and homotopy types , J. Pure Appl. Alg., 86, (1993), 135 – 154.
J. Duskin, A simplicial matrix approach to higher dimensional category theory I: nerves of bicategories , Theory and Applications of Categories, 9, (2002), 198 – 308,tac.mta.ca/tac/volumes/9/n10/9-10abs.html).
John W. Duskin, Non-abelian cohomology in a topos, Reprints in Theory and Applications of Categories, No. 23 (2013) pp. 1-165