George Fox was the founder of the Quaker movement.
Hi Kristin,
I think Quaker Gardens is just an open burial ground and unlikely to be anyone 'official' around, but you should be able to find it easy enough and the graves you want.
If you had any more free time, you might find the walk below interesting .. it is only short train ride out of London and then visits some communities in what was once a Quaker heartland. Also goes to the meeting hall where William Penn is buried
https://www.walkingclub.org.uk/walk/beaconsfield-circular/
best, Tom