George Ord was an American zoologist who specialized in North American ornithology and mammology. Based in part on specimens collected by Lewis and Clark in the North American interior, Ord's article "Zoology of North America" (1815), which was published in the second American edition of William Guthrie's Geographical, Historical, and Commercial Grammar, has been recognized as the "first systematic zoology of America by an American".
Thomas Nuttall was an English botanist and zoologist who lived and worked in America from 1808 until 1841.
John Cassin was an American ornithologist from Pennsylvania. He worked as curator and Vice President at the Philadelphia Academy of Natural Sciences and focused on the systemic classification of the Academy's extensive collection of birds. He was one of the founders of the Delaware County Institute of Science and published several books describing 194 new species of birds. Five species of North American birds are named in his honor.
Thomas Horsfield M.D. was an American physician and naturalist who worked extensively in Indonesia, describing numerous species of plants and animals from the region. He was later a curator of the East India Company Museum in London.
The Academy of Natural Sciences of Drexel University, formerly the Academy of Natural Sciences of Philadelphia, is the oldest natural science research institution and museum in the Americas. It was founded in 1812, by many of the leading naturalists of the young American republic with an expressed mission of "the encouragement and cultivation of the sciences". For over two centuries of continuous operations, the Academy has sponsored expeditions, conducted original environmental and systematics research, and amassed natural history collections containing more than 17 million specimens. The Academy also has a long tradition of public exhibits and educational programs for both schools and the general public.
Titian Ramsay Peale was an American ornithologist, entomologist, photographer, and explorer from Philadelphia, Pennsylvania. He was a scientific illustrator whose paintings and drawings of wildlife were known for their beauty and accuracy.
John Lawrence LeConte was an American entomologist of the 19th century, responsible for naming and describing approximately half of the insect taxa known in the United States during his lifetime, including some 5,000 species of beetles. He was recognized as the foremost authority on North American beetles during his lifetime, and has been described as "the father of American beetle study."
François Victor Masséna, 2nd Duke of Rivoli and 3rd Prince of Essling was an amateur ornithologist. He was the youngest of four children of André Masséna, 2nd Prince of Essling and Anne Marie Rosalie Lamare.
Samuel Stehman Haldeman was an American naturalist and philologist. During a long and varied career he studied, published, and lectured on geology, conchology, entomology and philology. He once confided, "I never pursue one branch of science more than ten years, but lay it aside and go into new fields."
Charles Conrad Abbott was an American archaeologist and naturalist.
Witmer Stone was an American ornithologist, botanist, and mammalogist, and was considered one of the last of the “great naturalists.” Stone is remembered principally as an ornithologist. He was president of the American Ornithologists’ Union (AOU) 1920–23, and was editor of the AOU's periodical The Auk 1912–1936. He spearheaded the production of the 4th edition of the AOU checklist, published in 1931. He worked for over 50 years in the Ornithology Department at the Academy of Natural Sciences of Philadelphia, eventually serving as Director of the institution. Stone was one of the founding members of the Delaware Valley Ornithological Club (DVOC) in 1890 and was actively involved in the organization for the remainder of his life. Stone was one of only two scientists to serve as president of both the AOU and the American Society of Mammalogists, and he co-authored two popular books about mammals. His outstanding botanical contribution was The Plants of Southern New Jersey, published in 1911. Stone spent many summers at Cape May, New Jersey, summering there annually starting in 1916. He is best remembered for his two-volume classic Bird Studies at Old Cape May, which was published by the DVOC in 1937, two years before his death.
Frank Miles Day was a Philadelphia-based architect who specialized in residences and academic buildings.
Henry Shimer was a naturalist and physician in Mount Carroll, Illinois. He was also a teacher at the Mount Carroll Seminary, which later became Shimer College; he was the husband of the seminary's founder, Frances Shimer.
Thomas Harrison Montgomery Jr. was an American zoologist who made important contributions to cell biology–especially in chromosomes and their roles in sex determination–as well as the biology of birds and several groups invertebrates, naming many species of ribbon worms, rotifers, and spiders. He studied in Berlin before becoming a researcher and professor at the University of Pennsylvania, where he primarily worked until his death at the age of 39. In his short career he published 80 scientific papers and two books.
Margaretta Hare Morris was an American entomologist. Morris and the astronomer Maria Mitchell were the first women elected to the American Association for the Advancement of Science in 1850. She was also the second woman elected to the Academy of Natural Sciences of Philadelphia in 1859, after Lucy Say.
Annette Frances Braun (1884–1978) was an American entomologist and leading authority on microlepidoptera, kinds of moths. Her special interest was moths whose larvae live as leaf miners.
The Delaware Valley Ornithological Club (DVOC) is the one of the oldest ornithology organizations in the United States. Founded in 1890, the club has held regular meetings at the Academy of Natural Sciences of Philadelphia for over 125 years, and has published the periodical Cassinia since 1901. Membership is open to any dues paying person with an interest in birds. The club organizes birdwatching field trips throughout the Delaware River valley region, including a dedicated year-round trip schedule within the city limits of Philadelphia.
Morgan Hebard was an American entomologist who specialized in orthoptera, with a collection of over 250,000 specimens.
Reuben Haines III was a Quaker farmer, brewer, abolitionist, scientist, ornithologist, meteorologist, firefighter, philanthropist, and educational reformer from Philadelphia, Pennsylvania.
John Krider was an American gunsmith and ornithologist who operated a sporting goods store on the northeast corner of Second St. and Walnut St. in Philadelphia, Pennsylvania, for much of the 19th century. On the second floor of Krider's shop was a taxidermy shop, where hundreds of bird specimens were prepared over multiple decades.
