Welsh community leadership Rees has been described as a leader within Liverpool's Welsh community. He established various Welsh cultural organisations in Liverpool, including the Merseyside Chair
Eisteddfod and the Council of Welsh Chapels on Merseyside, and founded the local community newspaper
Yr Angor/The Anchor, which he edited from 1979.
Selected publications Rees has authored or edited over 80 books in Welsh and English over six decades. Notable works include: •
Mahatma Gandhi: Pensaer yr India (1970) •
Chapels in the Valley: A Study in the Sociology of Welsh Nonconformity (1975) •
Pregethwr y Bobl: Bywyd a Gwaith Dr Owen Thomas (1979) •
The Liverpool Welsh and their Religion (co-authored with R. Merfyn Jones, 1984) •
The Welsh of Merseyside series (1997–2001) •
A Life Unlimited: An Autobiography (2018) •
The Welsh in Liverpool: A Remarkable History (2021) • ''Hanes Tregaron a'r Cyffiniau'' (2022)
Themes and subjects Rees has written extensively on Welsh
Nonconformity, the Liverpool Welsh community, and biographies of prominent Welsh political figures including
Jim Griffiths and
Cledwyn Hughes. His theological works include studies of
John Calvin and
Calvinism. One of his works on the Liverpool Welsh was longlisted for
Wales Book of the Year in 2020. == Personal life ==