He Loved and Served
From Bahaipedia

Curtis Kelsey was called upon by ‘Abdu’l-Bahá to install the first electric lighting in the Shrine of the Báb. He spent two months in ‘Abdu’l-Bahá's household and it changed his life.
Full Title[edit]
He Loved and Served: The Story of Curtis Kelsey
Author[edit]
Publisher[edit]
ISBN[edit]
978-0-85398-121-3