As of 2024, Alexander is a commentator and analyst on Fox League, and a co-host (with Andrew Voss) of the radio show "Breakfast with Vossy & Brandy" on Sports Entertainment Network.
Greg continued playing with the Panthers for the next several years and become known for his unique ability to score and set up tries, his excellent attacking kicking and his solid defence.
At the end of the 1986 NSWRL season, he went on the 1986 Kangaroo tour, gaining selection after Parramatta winger Eric Grothe was controversially ruled out with a knee injury.
During the 1989 NSWRL season, his pace and skill had made Penrith the second most dangerous attacking team in the competition behind the eventual premiers, the Canberra Raiders and Alexander was the Panthers leading try and point scorer and for much of the year led the league in try-scoring – scoring ten tries in eight games at one point, eventually finishing with 15 tries from 18 games for the season.
Alexander finished ahead of other noted try scorers including Andrew Ettingshausen (Cronulla), Ricky Walford (St George) and Phil Blake (South Sydney).
With Alexander in great form at both halfback and fullback for the Panthers, the club made it to their first ever Grand Final in 1990 against the defending premiers Canberra.
[8][9] In the 34–10 second test win a week later at the Stade Gilbert Brutus in Perpignan, a hamstring injury ruled out Laurie Daley.
In his only Test on the flank, Brandy kicked 3 goals to go along with his memorable try where he evaded French fullback David Fraisse who had earlier shown great pace to run down Kangaroos speedsters Shearer and Andrew Ettingshausen and prevent both from scoring.
Despite his good form for Penrith and NSW and the absence of Gary Belcher through injury, Alexander was overlooked for the first test of mid-season Trans-Tasman Test series against New Zealand in favour of boom Brisbane and Qld fullback Paul Hauff, while he also missed selection in the final two games when selectors chose Andrew Ettingshausen.
Following the Panthers Grand Final win over Canberra, Alexander was selected for Australia's 5 game tour to Papua New Guinea but withdrew through injury.
He recovered from injury in time to lead the Panthers to England in October for the 1991 World Club Challenge, which was lost to Wigan 21–4 at the Anfield Stadium.
[13] The tragic loss of the younger Alexander had an adverse effect on the close-knit Panthers club and the team's form dropped off in the second half of the year which saw them miss the finals.
To date, he is one of only seven players ever score over 100 tries and over 1,000 points for a single club in top grade Australian rugby league.
[20] On 25 June 2016, he was inducted into the Penrith Panthers hall of fame alongside Grahame Moran, Royce Simmons, and Craig Gower.
On 28 August 2023, Alexander was informed by the NSWRL board that his contract would not be renewed as advisor to the New South Wales coaching staff.
He is also the brother-in-law of former St. George Illawarra Dragons hooker Cameron King, who is the younger brother of his wife Tanya.