Keed is a stalwart of the game, having worked at high-profile organisations Ford Performance Racing and DJR Team Penske either side of his time at BJR, where he guided Fabian Coulthard to the front of the field.
More recently, he'd been a critical figure at Team 18 since its revamp ahead of the 2019 season, when he was hired to head up its engineering department.
Having worked directly on Mark Winterbottom's car that season, he assumed an overarching position the following year as Manuel Sanchez and Matt Saunders became the expanded squad's race engineers.
But COVID-19 staffing challenges soon enough saw Keed take over from Saunders on Scott Pye's #20, and he'd remained in that role ever since, the combination taking a hat-trick of Darwin podiums in 2020.
Long-time Garry Rogers Motorsport guru Richard Hollway was then recruited as Team 18's head of engineering before last season.
A top job opened up at BJR in recent months when the Albury outfit's long-time engineering manager Andrew Edwards signed with Triple Eight Race Engineering to work with two-time champion Shane van Gisbergen.
Team manager Pete Vale was lured to Matt Stone Racing to be its new team principal, while Edwards has started his new journey at Triple Eight.
It's not entirely clear yet what title Keed will hold at BJR.
Edwards aside, BJR's 2021 race engineers were Tony Woodward, Tom Wettenhall (working with Macauley Jones) and Paul Forgie (Jack Smith), with Paul Scalzo and Julian Stannard key figures behind the scenes.
Team 18 owner Charlie Schwerkolt wished Keed well.
“Phil is a very good friend, which he still is today; we have just had a bit of a reshuffle,” Schwerkolt told Speedcafe.com.
“He's a genius, an incredible intellect, and I really appreciate all his support over the time. He is one of the foundation people in bringing the team to where it is today.
“He's an incredible guy, but we made a change in the team and he's moving onto a new chapter in his life.”
Both Team 18 and BJR are due to hit the track at Winton Motor Raceway on February 22 as part of pre-season testing, before the Supercars season opens at Sydney Motorsport Park on March 4-6.