Background
He was born on December 23, 1801 in Philadelphia, Pennsylvania, United States, the son of Adam and Maria Sarah (Pepper) Seybert.
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He was born on December 23, 1801 in Philadelphia, Pennsylvania, United States, the son of Adam and Maria Sarah (Pepper) Seybert.
His early education was supervised by his father, whose traveling companion and scientific assistant he became. Later he studied at the Ecole des Mines at Paris.
In Philadelphia he was made, at the early age of twenty-one, a member of the American Philosophical Society. Having acquired a keen interest in science, he began a short but productive period as a contributor to the Transactions of the American Philosophical Society, the Journal of the Academy of Natural Sciences of Philadelphia, and Silliman's American Journal of Science and Arts. In his papers he analyzed tourmalines, manganesian garnets, glassy actynolite, crysoberyls, pyroxene, tabular spar, chromite, colophonite, fluosilicate of magnesia, and bog iron ore.
In communications to Silliman's Journal (January, May 1823) he engaged in a controversy with Thomas Nuttall and other mineralogists over the identity of certain specimens previously classified by Cleaveland and Bruce.
Though after his father's death in 1825 he seems to have lost something of the eager interest in mineralogy which had formerly characterized him, occasional papers by him appeared. He analyzed the meteorite which was first described by Bowen.
For the last half of his life Seybert devoted his attention and a large fortune to the promotion of human welfare and to the encouragement of an interest in science. He died in 1883.
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He became greatly concerned as to the proper disposal of his wealth, consulting on this question a number of the high church dignitaries of Europe.
Quotes from others about the person
Seybert was not a "blind believer in spiritualism, but his desire was to have a fair, searching, and, as far as possible, scientific examination" of its claims" (Pepper, quoted by Thorpe).
He never married.