He lived in the UK at Barrowford, Lancashire and then in Derby, until the family emigrated to Canada circa 1967.
Dr. Tunnicliffe's work has taken him to over 100 countries. He has served as the executive director of an international agency and an organizational consultant. From 1999-2002 he led a multi-national team to develop the Refugee Highway Partnership, a World Evangelical Alliance network that builds collaboration among the 350 organizations serving refugees around the world.
He also served as Director, Global Initiatives for the Evangelical Fellowship of Canada, served on the board of Micah Challenge International. The Micah Challenge is a global campaign of the World Evangelical Alliance and the Micah Network to mobilize Christians against poverty. The campaign aimed to deepen Christian engagement with impoverished and marginalized communities, and to influence leaders of rich and poor nations to fulfill their promise to achieve the Millennium Development Goals.
In addition to numerous magazine articles, Dr. Tunnicliffe has authored several books, including "101 Ways to Change Your World.""
He frequently speaks at churches, conventions, and universities, on major global issues such as poverty, HIV/AIDS, human trafficking, human rights, interfaith dialogue and spirituality. He regularly meets with government leaders and members of the media to provide an evangelical Christian perspective to current events.  .    
Geoff and his wife Jewel live in Vancouver, Canada. They have two adult children, Justin and Natasha.