A tribute to George F. Pinder

In the fall of 2001 a Special Session was convened at the Fall Meeting of the American Geophysical Union as a tribute to George F. Pinder's contributions to groundwater modeling in the last thirty-five years. At a subsequent meeting of the editorial board of Advances in Water Resources (AWR), we reflected on George's contributions to the field of groundwater hydrology and his particular contributions to AWR, which he co-founded in 1977 with Carlos A. Brebbia. It was at this meeting that the seed for compiling a special issue of AWR in honor of George's contributions was sown.