Steven Douglas Kelly was born in 22nd April 1951 in the city of New York. He grew up in San Francisco, USA.
Raised as a Catholic, in the early 1970s he became a member of the Children of God while in Amsterdam, Netherlands. Shortly after joining he Changed his name to Peter Amsterdam and became involved with the publications for the organization.
In 1978 Steven began living with David Berg and Karen Zerby and worked closely with them for a number of years.