His father was French emigre who came from Haiti at the time of slave revolt then moved to Cuba; his mother Felicie de Saint-Félix Doutre, a Creole born in New Orleans.

1865, while working at The Enterprise Mining and Boring Co. he applied for a patent on 'improved mode' of drilling oil wells.

He was elected librarian and held some office in ACS: secretary, vice-president and member of the board of directors.

[7] Casamajor was a frequent and industrious contributor to the Journal of the American Chemical Society with original papers, abstracts and reviews.

After his sudden death, his widow was left to take care of the family, which was very integrated in society in Brooklyn, a town that did not become part of New York City until 1898.