Agent Alphonse, real name Dr Joseph (Joe) Camp, is the leader of Cell A and overall head of Delta Green. He is a veteran of the original World War II Delta Green and conducted operations in Australia, Tibet, China and Southeast Asia, among other places.
Joe has been known to use magic, but discourages its use by Delta Green Agents. He is a strong believer in compartmentalisation of cells and a need-to-know approach. Opinion is divided as to whether this represents Joe trying to protect Agents from insanity, or just the Keeper being a bastard.
A detailed character history, complete with CoC and D20 stats, can be found here.