[1] In the winter of 1843–1844, the Flakes were converted by Benjamin L. Clapp, a missionary from the Church of Jesus Christ of Latter Day Saints.

William Jordan Flake, eldest son of James and Agnes, remembered "being taken to the top of the Nauvoo Temple by our Negro servant Green, and viewing the surrounding country for miles in every direction.

"[4] Green Flake was a part of the first group of Latter Day Saints to leave Nauvoo for the West and participated in the initial establishment of Winter Quarters, Nebraska.

[6] Green was re-baptized on August 8, 1847, by Tarleton Lewis and confirmed the same day by Wilford Woodruff; many Latter-day Saints were rebaptized when they reached the Salt Lake Valley to show their commitment to the faith.

[1][5] Upon his arrival in the Salt Lake Valley, Green built a log cabin in Cottonwood (now known as Holladay, Utah),[5]: 5  and planted crops as James Flake had required him.

In his dissertation on the history of Black people in Utah, Ronald Gerald Coleman states that Brigham Young freed Flake.

[10]: 224  An article on the Pioneer Day celebrations in Salt Lake City noted his presence there, describing him as "a vigorous, broad-shouldered, good-natured, bright old gentleman.

"[11] One of Flake's descendants was Lucille Bankhead, a civil rights activist in Utah and the first Relief Society president of the Genesis Group.