St George played his club rugby league in Auckland for the Marist Old Boys side initially before moving to Devonport United (North Shore Albions) where he spent most of his career.

He had 6 siblings, the eldest born in 1886 was unnamed in the New Zealand Births, Deaths and Marriages records, Stewart Lyell (b.1899), Lillian Edith Melba (b.1903), Laurel Margaret (b.1906), Ella Mavis (b.1908), and Allen Alfred St George (b.1910).

Neville was a fitter by trade and at the time of his enlistment in World War 1 was living at Pine Lodge, Great North Road, Grey Lynn.

Soon after returning from the war St George joined the newly formed Marist Old Boys rugby league club who had been admitted to the first grade championship in their inaugural season of 1919.

The only other specific mention of him during a match report was after a 10–5 win over City Rovers in the final round of the first grade championship on the Auckland Domain before a crowd of 6,000.

It is unknown if he had requested a transfer due to not receiving playing time for Marist or because he had moved to the Devonport area where North Shore were based.

[10] After transferring to Devonport United, St George made his first grade debut almost immediately, playing for them against Ponsonby on 16 July in the first round of the Roope Rooster at the Auckland Domain.

The Auckland Star said that “the best of the Devonport forwards were [Alf] Scott, St George, and Wheeler, and in the backs Stan Webb, Bert Laing, and Tommy Taylor”.

[25] Then, on 7 October, St George was selected to make his full Auckland debut in a match against a newly formed and short lived Bay of Plenty team at the Tauranga Domain.

[28] The following week St George was sent off midway through the second half for the first time in his career along with future New Zealand representative Alf Townsend of City.

The Auckland Rugby League decided to make the two teams play off for the title and Marist won narrowly by 20 points to 17 before a club record crowd of 17,000 at Carlaw Park.

In a round 4 loss to Ponsonby it was said that “St George’s hooking of the ball in the scrums was a feature of the play, and he beat a recognised hooker like Lowrie badly”.

Early in the match Arthur Singe picked the ball “up off the ground [and] whipped the leather to St George, who scored in a good position”.

The Auckland Star said “St George, who has given some fine exhibitions of hooking this season, will be making his first appearance in big football, but he has earned his place and can be relied upon to get his share of the ball”.

[53] The Herald said that “the visiting forwards played solidly and won the ball from the scrum on the majority of occasions, although the New Zealand hooker, St George, did his part well”.

“The winners were reinforced by Webb, Cleaver, Stewart and St George, all good players who had been injured early in the season, and there is no doubt that the quartet made a big difference”.

[62] After the 12 June matches the Herald speculated on who might be selected for the New Zealand side and said “among the local players there is no outstanding hooker, but several get their share of the ball every Saturday.

[67] In a 31-13 Devonport win over Marist Old Boys on 24 July “St George made an opening and sent Len Scott away with a 40 yards run” for a try.

[74] In the match between Auckland and the touring side the Herald said “St George has on many occasions proved himself a capable hooker, but on Saturday he was at his best and outplayed Carroll, his vis-à-vis.

[79] Early in 1927 it was rumoured that St George and Alf Townsend had been approached by the newly formed City rugby union club to play for them.

St George and A.C. Townsend at the Newmarket railway workshops, the object being to induce the league players named to join up with the new City rugby union club.

[90][91] He was singled out by the Auckland Star which said “St George is deserving of worthy mention for the reason that he invariably beat a champion hooker in Lowrie for the ball in the set scrums”.

But it did not take the veteran leaguer, St George, very long to see this weak point, and he wasted no time in “cooking” Ken's tactics in the front row”.

Wally Somers had been selected at hooker but had broken a bone in his foot, however St George also became unavailable and Joseph Peckham came into the side.

[99] Unusually Auckland chose not to play a recognised hooker and instead used Payne, and they lost the match 29-12 and the Northern Union Challenge Cup for the first time in 5 years.

As a hooker St George, a big hefty fellow, is a crack-a-jack, and from 90 percent of the scrums he got the ball, and this gave the “black” rearguard members some golden opportunities which in many cases they took full advantage of”.

[105] With the representative season approaching the newspapers noted that St George and Wally Somers “have shown enough form to warrant serious consideration when it comes to choosing a hooker”.

Newton won 23–16 at Carlaw Park with the Herald saying “St George surprised by his ability in getting the ball from the scrums against such a fine hooker as Somers.

[110] It was said that “there was not a great deal between St George and Campbell as hookers on the full run of the day, but the Devonport man was a shade the best, and has the physique for the middle of the front arch”.

The match was drawn 13–13 with the Sun reporting that "St George was also in the limelight a good deal, although in the scrums he was not seeing so very much of the ball against the Marists hooker Campbell".