[1] He supervised the construction of the historic church at Russell and was involved in the Treaty of Waitangi proceedings, a collection consisting of his journals and papers was added to the UNESCO Memory of the World New Zealand register in 2018.

[4] Charles Darwin along with Robert FitzRoy (later 2nd Governor of New Zealand) and the officers of HMS Beagle contributed £15 towards the construction.

[6][7] In 1840, as a result of the absence of Henry Williams, Baker was responsible for overseeing the CMS Paihia headquarters.

[9][10] In the second, Hobson requested to use Baker's church at Russell (then called Kororāreka) the following day to read his Proclamations.

"[13][nb 1]Colenso then describes how, prompted by this dialogue, James Busby and Henry Williams successively made statements in English defending their respective land holdings.

He claims Tamati Pukututu, chief of the Te Uri-o-te-hawato tribe (a sub-tribe (Hapū) of the Ngāpuhi tribe), also spoke in defence of the missionaries and chastised Moka, and several of his fellow chieftains, for having sold their land in return for foreign goods.

[17] While at Tolaga Bay Baker benefited significantly from the support and protection of important chief Te Kani-a-Takirau.

In 1854, sufficiently recovered from his period of ill health, Baker left Auckland to take charge of the Rangitukia mission station.

[22] He retired to Auckland in 1865 where, until his health deteriorated, he was active preaching; regularly visiting the stockades and the hospital.

Baker died on 6 February 1875 after a period of illness and is buried at St Stephen's Churchyard, Parnell, Auckland.

Baker married secondly Hannah Maria Bailey, daughter of William Bailey and Hannah Goadby, on 11 June 1827 by whom he had 13 children including: In 2018 Baker's journals and papers were added to the UNESCO Memory of the World Aotearoa New Zealand Ngā Mahara o te Ao register, which recognises heritage items of national significance.