Sproat played senior rugby in Christchurch and Wellington before retiring from playing and moving into club administration, including being a member of the New Zealand Universities Rugby Council from 1995 until 2015, being instrumental in redeveloping relationships with Japan rugby.
He and his wife settled in Napier in 2018.
As part of HBRU's ongoing commitment to build director capability and plan for succession within the board, legal firm partner Kirsty Kupa, of Otane, has been appointed as aspiring director.
The 2021-2022 board of directors is: Brendan Mahony (chairman), Peter Davis, Danny Gough, Emma Jensen, Mavis Mullins, Craig Riddiford, Mark Sowman, John Sproat.