Lavater brothers
The Lavater brothers were Johann Heinrich Lavater and Johann Jacob Lavater, both Swiss physicians and naturalists.
Biography
The brothers were the sons of Heinrich Lavater, also a physician, and a professor of physics and mathematics in Zürich.Johann Heinrich gained his doctorate in Basel in 1647, and became a physician in Bern in 1653. In 1668 he prepared the Zürich Ordinance about plague. He became professor of medicine and natural history at the Carolinum, Zürich.
Little is known of Johann Jacob, except that he too was a physician and a naturalist.