James Fallows is an accomplished journalist, author, and commentator who is renowned for his insightful and thought-provoking writings. A synonym for Fallows could be "influential", as his work has had a significant impact on the public discourse. Another suitable synonym would be "perceptive" as Fallows possesses a keen and astute understanding of various subjects. Additionally, "prolific" aptly describes Fallows due to his extensive body of work that spans multiple genres and topics. Lastly, "knowledgeable" is an appropriate synonym, considering his extensive research and expertise in diverse fields such as politics, technology, and international relations.