The former striker had a couple of spells as a player at Firhill before managing the side for two years until 2005.
He is now back at the club in his new role after the academy was established thanks to the support of Euromillions winners Colin and Chris Weir.
Britton said: "They have agreed to fund us with £750,000 for three years.
"At a time when most clubs are cutting back on youth development, to be given that input really is phenomenal.
"Colin and Chris Weir have been Thistle supporters for a long time and they wanted to become involved.
"They spoke to the chairman David Beattie about how they could get involved and after discussions this is what they came up with.
"It's a fantastic opportunity for me to be given the job.
"What shows just how excited I am about this opportunity is that I'm giving up my job as a lawyer to do this.
"That speaks for how I feel about the job and having this opportunity.
"We can't thank them enough for making this gesture."
Britton added: "We are going to be able to offer the six elite teams in the Academy treatment on a par with the first team in terms of their sports science, their physio, nutrition, sport psychology - all these factors that go into making up a player.
"Not only that, we will be able to increase the number of kids to potentially come into the Academy and we will be able to put on more sessions.
"It's giving far more kids the opportunity to get on the pathway to professional football."
Meanwhile, Britton has been impressed by the efforts of the Partick first team after returning to the top flight this season.
He said: "They've had a fantastic start to the season.
"It's great to see the crux of last year's First Division championship team playing in the top flight and showing what they are capable of.
"It's a long, hard season but they've got themselves in a great position at this stage and hopefully they can build on it."