Callender was born at Clifton, and, after education at a Bristol school, became a medical student at St. Bartholomew's Hospital in 1849.
[1] Callender lived in Queen Anne Street, married Sophia Bousfield in 1859,[2] and had several children.
Callender published a paper on the Development of the Bones of the Face in Man in the Philosophical Transactions for 1869, which led to his election as Fellow of the Royal Society in 1871.
In the Proceedings of the Royal Society there are abstracts of papers by him on the anatomy of the thyroid body and on the formation of the sub-axial arches of man.
In 1863 he published a short book on the anatomy of the parts concerned in femoral rupture.