Context: Historically Whitehead's work has been most influential in the field of American progressive theology. The most important early proponent of Whitehead's thought in a theological context was Charles Hartshorne, who spent a semester at Harvard as Whitehead's teaching assistant in 1925, and is widely credited with developing Whitehead's process philosophy into a full-blown process theology. Other notable process theologians include John B. Cobb, Jr., David Ray Griffin, Marjorie Hewitt Suchocki, C. Robert Mesle, Roland Faber, and Catherine Keller.

Question: In what field of study has Whitehead's work been most influential in the United States?
Answer: American progressive theology

Question: Who was the most important early supporter of Whitehead's work in the context of theology?
Answer: Charles Hartshorne

Question: What advancement of Whitehead's process philosophy is attributed to Charles Hartshorne?
Answer: developing Whitehead's process philosophy into a full-blown process theology

Question: Who are some other distinguished process theologians?
Answer: John B. Cobb, Jr., David Ray Griffin, Marjorie Hewitt Suchocki, C. Robert Mesle, Roland Faber, and Catherine Keller

Question: In what field of study has Whitehead's work been less influential in the United States?
Answer: Unanswerable

Question: Who was the least important early supporter of Whitehead's work in the context of theology?
Answer: Unanswerable

Question: What advancement of Whitehead's process philosophy is not attributed to Charles Hartshorne?
Answer: Unanswerable