Anyone interested in Dorothy Day should also be interested in Peter Maurin. They met through a mutual contact who believed their ideas were very similar. They completed each other, Day putting into practical action the ideals that had been circulating in Maurin's mind as he traveled from France through Canada and finally to the US.
Read "Peter Maurin: Gay Believer", by Arthur Sheehan, one of the few books available on Maurin.
Maurin was a powerful thinker who spoke and taught very simply. His life was prophetic - he not only ministered to the widow, orphan, and stranger, but also lived as one (and not simply "like" one!). The force of his writing comes from the holiness of his life. Day herself says it: "It was the sanctity of the man that made [his writings] dynamic."