Eamonn O'Brien (mathematician)
Eamonn Anthony O'Brien FRSNZ is a professor of mathematics at the University of Auckland, New Zealand, known for his work in computational group theory and p-groups.His dissertation, The Groups of Order Dividing 256, was supervised by Michael F.[1] O'Brien's early work concerned classification, up to isomorphism, of groups of order 256.These classifications comprise the tables provided in the computer algebra systems SageMath, GAP, and Magma.For a 20-year span from the mid-1990s, O'Brien led the so-called Matrix Group Recognition Project whose primary objective is to solve the following problem: given a list of invertible matrices over a finite field, determine the composition series of the group.