He was apprenticed as a carpenter at York, and after completion, he joined the Parliamentary Army during the English Civil War.
After this first establishment, Edmundson spent the rest of his life building the Society of Friends in Ireland.
Edmundson also visited America and debated the Protestant theologian Roger Williams in Rhode Island (New England) in 1672 with several other Quakers, and Williams was particularly offended by Edmundson's perceived rudeness.
[4] He married firstly in 1652 Margaret Staniforth or Stanford who died in 1689 and secondly Mary Strangman who survived him.
He had nine children, Thomas, Mary, William, Samuel, Hindrance, Susanna, Anna, Tryal.