The author of the multi-volume devotional commentary has his own wikipedia page. Here is a little blurb upon his background, along with a couple of paragraphs explaining what the Oxford Movement was about - which also has it's own wiki page.
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The Reverend Isaac Williams (1802–1865) was a prominent member of the Oxford Movement (or "Tractarians"), a student and disciple of John Keble and, like the other members of the movement, associated with Oxford University. A prolific writer, Williams wrote poetry and prose including the well known Tract: "On Reserve in Communicating Religious Knowledge".
The Oxford Movement was a movement of High Church Anglicans, eventually developing into Anglo-Catholicism. The movement, whose members were often associated with the University of Oxford, argued for the reinstatement of lost Christian traditions of faith and their inclusion into Anglican liturgy and theology. They conceived of the Anglican Church as one of three branches of the One, Holy, Catholic, and Apostolic Church.
It was also known as the Tractarian Movement after its series of publications Tracts for the Times, published between 1833 and 1841. The group was also disparagingly called Newmanites (pre-1845) and Puseyites (post-1845) after two prominent Tractarians, John Henry Newman and Edward Bouverie Pusey.