Robert J. Twiss
Robert J. Twiss is an American geologist emeritus of University of California, Davis. He made his Ph.D. 1971 at Princeton University. First in his career he researched viscosity of earth mantle.<ref name="DOI10.1016/0012-821x(76)90160-6"> </ref> Nowadays he interests for the mechanisms and mechanics of rock deformation and the interpretation of connected structures.<ref name="DOI10.1016/0191-8141(90)90035-w"> </ref> Together with geologist Eldridge M. Moores he has co-authored two famous textbooks: "Tectonics" and "Structural Geology".