Bartholomew Warner was born in about 1556, and is described as "of Kent, pleb." in Alumni Oxonienses.
Warner was matriculated at the University of Oxford from Lincoln College at the age of 19 in 1575, and is described as "Dialecticus" (a logician). He obtained his BA from St John's College on 14 February 1575/6 and his MA on 19 March 1578/9.
In 1583 Warner married Elizabeth Dobson, stepdaughter of John Case. (Case (1546""1600), was a Fellow of St John's College who lost his fellowship when he was compromised with Elizabeth Dobson, the widow of a former keeper of the Bocardo prison, and obliged to marry her.)
Warner's son Henry was born in June 1593
Warner obtained his B.Med. on 27 January 1585/6 and his D.Med. on 1 July 1594, and was appointed Regius Professor of Medicine in 1597, a position he held until 1612. He was succeeded in the Regius Professorship by Thomas Clayton, who had married his daughter. He was also a "superior reader of Linacre's lecture".
Warner was buried at St Mary Magdalen Church on 26 January 1618/19. Administration of his will was granted in the Chancellor's Court at Oxford on 29 January 1619.