He also served as one of the first teachers in the area, and was one of the founders of St. Michael's Catholic Church in Flint.

O'Sullivan settled on this plot of land in 1853, and soon after constructed the house that now stands here.

In 1858, O'Sullivan sold the house to John and Elizabeth Ponsford, who had arrived in Flint Township from England in 1854.

The Ponsfords continued to operate the Halfway House as an inn, and O'Sullivan returned to Flint and opened a store.

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