Gary was an Assistant Coach to Geoff Richards in 2006 before taking over as Head Coach a year later. He coached them to the final of the 2010 Women's Rugby World Cup losing to the Black Ferns in the final.
Under his tutelage they won five Six Nations's in a row and two Nations Cup. England Women won the 2014 women's World Cup 21-9 against Canada. The assistant coaches were Graham Smith and Simon Middleton. He is currently the most successful English rugby coach in history. Gary was UK overall and High Performance coach of the year 2014. He was awarded Pride of Sport coach of the year and nominated in BBC SPOTY coach of the year. England women's team were awarded Team of the Year. The squad and staff were given Freedom of the Borough of Rugby.

Gary is currently head coach at Oxford University Women's rugby team with their first ever Twickenham varsity in December 2015.