Sanfey was educated at Trinity College Dublin and trained to be a barrister at the King's Inns.
[1] Sanfey specialised in aspects of insolvency law while in practice, including cases involving examinership, bankruptcy, receivership, and liquidation.
[8] He appeared for Michelle Rocca in 2015 in the High Court relating to a land dispute with her neighbour.
[14] He has heard cases involving bankruptcy, insolvency law, injunctions, judicial review, and professional misconduct.
[15][16][17][18][19] He replaced Denis McDonald as the High Court's designated judge hearing personal insolvency matters.