John has written or contributed to a wide range of reports and publications concerning housing and homelessness and is a frequent public speaker and broadcaster on housing and related matters.
Mae John wedi ysgrifennu neu gyfrannu at ystod eang o adroddiadau a chyhoeddiadau yn ymwneud â thai a digartrefedd ac mae'n siaradwr cyhoeddus a darlledwr mynych ar dai a materion cysylltiedig.