Current lead developers:

Mark Abraham <mark.j.abraham@gmail.com>
David van der Spoel <spoel@gromacs.org>
Berk Hess <hess@gromacs.org>
Erik Lindahl <lindahl@gromacs.org>

A full list of GROMACS contributors is available at http://www.gromacs.org/About_Gromacs/People
