Richard Heitzenrater of Duke Divinity School is considered by many to be the foremost expert on eighteenth-century Methodism.
If you are United Methodist and have attended seminary since 1995, you have (or should have) read Wesley and the People Called Methodists. This book is the standard history of John Wesley and early Methodism and it is required reading in every Methodist History course for which I have seen a syllabus.- Kevin Watson
http://vitalpiety.com/tag/richard-p-heitzenrater/
Amazon listing for book.