Robert initially followed his father in working for the de Vere family, Earls of Oxford, but later worked for the crown. He served on a diplomatic mission to France in 1327 and was returned as a member of parliament for the county of Essex in 1328-9, 1330, 1332, and 1339. He held a number of judicial positions, despite no evidence for legal training, and in 1334 he was chief justice of the king's bench in Ireland, but never took up office. His military career was more active, joining the invasion of Scotland in 1335, was stated to have been present at the Battle of Cadsand in 1337 and travelled with Earl of Northampton on Edward III's expedition to Flanders in 1338. On 3 June 1341 he received, in the name of Robertus Bourghchier, Stanstede, a royal licence to crenellate his house at Stanstead in the parish of Halstead in Essex. On his return to England, the king Edward III committed the great seal, which had been alternating between Archbishop John de Stratford and his brother Robert de Stratford, the Bishop of Chichester, to Bourchier, who thus became, on 14 December 1340, the first lay chancellor. His salary was fixed at £100, besides the usual fees. In the struggle between the king and the archbishop, Bourchier withheld the writ of summons to the ex-chancellor, interrupted his address to the bishops in the Painted Chamber, and on 27 April 1341 urged him to submit to the king. When the parliament of 1341 extorted from the king his assent to their petitions that the account of the royal officers should be audited, and that the chancellor and other great officers should be nominated in parliament, and should swear to obey the laws, Bourchier declared that he had not assented to these articles, and would not be bound by them, as they were contrary to his oath and to the laws of the realm. He nevertheless exemplified the statute, and delivered it to parliament. He resigned his office on 29 October 1341. Robert continued to serve in the King's Council, as a diplomat and as a soldier. In 1342, he commanded a contingent in Brittany, and is recorded as being at the Battle of Crécy in 1346. He was summoned to parliament as a peer in November 1348 and from then was known as Lord Bourchier. He died the following year, of the Black Death in Bordeaux, while on a diplomatic mission to Castile with Joan of England, who died shortly after him. He was later buried at Halstead, where he had intended to found a college of eight chaplains.
Marriage and issue
At some time before 1329 he married Margaret Prayers, daughter and heiress of Sir Thomas Prayers of Sible Hedingham and his wife Anne of Essex, daughter of Hugh of Essex. They had two known children:
