Kereyn is the Secretary General of the New Zealand Olympic Committee. Her appointment to this role in early 2011 follows twenty years in sport leadership having been CEO of the New Zealand Academy of Sport South Island, General Manager of the Hillary Commission, as well as positions within Government and CEO of a sports trust.

Kereyn completed a six year stint as Vice President of International Netball, after six years as Chair of Netball New Zealand.

She has also served as a Trustee of the Forsyth Barr Stadium, Council Member of the University of Otago and Director of the Highlanders Rugby Franchise.