High Quality Content by WIKIPEDIA articles! Peter Alfred Ziegler (Winterthur, November 2, 1928) is a Swiss geologist, who made important contributions to the understanding of the geological evolution of Europe and the North Atlantic borderlands, of intraplate tectonics and of plate tectonic controls on the evolution and hydrocarbon potential of sedimentary basins. Ziegler’s career consists of 33 years as exploration geologist with the petroleum industry, 30 of which with Shell, and 20 years of university teaching and research.