In 1867, Brinkley returned to
Yokohama, Japan, never again to return home. Attached to the British-Japanese Legation and still an officer in the
Royal Artillery, he was assistant
military attache to the Japanese Embassy. He resigned his commission in 1871 to take up the post of
foreign advisor to the new
Meiji government and taught artillery techniques to the
Imperial Japanese Navy at the Naval Gunnery School. He mastered the Japanese language soon after his arrival, and both spoke and wrote it well. In 1878, Brinkley was invited to teach mathematics at the
Imperial College of Engineering, which later became part of
Tokyo Imperial University, remaining in this post for two and a half years. In 1878, media in Japan reported that Brinkley was married to Yasuko Tanaka, a daughter of a former samurai from the
Mito clan. The Japanese government approved the marriage in March 1886. Interracial marriages could be registered under Japanese law from 1873. It was the first official English-Japanese cross-culturally married couple in Japan. The British Legation, however, rejected Brinkley's marriage due to concerns about Tanaka's nationality issue arising from the marriage. Brinkley fought the rejection and eventually succeeded by appealing to the British judiciary in February 1890. They were the parents of two sons and a daughter. One of his sons was named Jack Ronald Brinkley. In 1881, Brinkley purchased
The Japan Weekly Mail (also known as the
Japan Mail). Since then and before his death, he was the newspaper's owner and editor-in-chief.
Japan Mail merged with the
Japan Times afterwards. The Japanese government financially supports the
Japan Mail. In exchange, the newspaper aligned with the Japanese government. While the
Japan Mail was the most widely read English newspaper in the Far East, many people criticised the newspaper's government support: Robert Young, owner of
Japan Chronicle, described the newspaper as "paid advocacy"; while some of them even criticised the newspaper as nothing more than a "government propaganda organ". After the
First Sino-Japanese War, Brinkley succeeded
Henry Spencer Palmer and became the Tokyo-based correspondent for
The Times of London. He gained fame for his dispatches during the
Russo-Japanese War of 1904–1905. Brinkley was awarded the
Order of the Sacred Treasure by
Emperor Meiji for his contributions to better
Anglo-Japanese relations. He was also an adviser to the
Nippon Yusen Kaisha, Japan's largest shipping line.
F.A. MacKenzie, a prominent English journalist, wrote: ''Captain Brinkley's great knowledge of Japanese life and language is admitted and admired by all. His independence of judgment is, however, weakened by his close official connection with the Japanese Government and by his personal interest in Japanese industry. His journal is regarded generally as a government mouth-piece, and he has succeeded in making himself a more vigorous advocate of the Japanese claims than even the Japanese themselves. It can safely be forecasted that whenever a dispute arises between Japanese and British interests, Captain Brinkley and his journal will play the part, through thick and thin, of defenders of the Japanese.'' Brinkley's last dispatch to
The Times was written from his deathbed in 1912, reporting on a
seppuku:
Emperor Meiji had recently died and to show fealty to the deceased emperor, General
Nogi Maresuke together with his wife committed
hara-kiri. ==Private life==