Hopkins was responsible for delivering the Queen Elizabeth Olympic Park and was widely praised for his focus on natural landscape, biodiversity and sustainability.
He led the London office of LDA Design before becoming project director for the Olympic parklands and public realm at the Olympic Delivery Authority between 2007 and 2011.
LDA senior partner Neil Mattinson who shared the park's design process with an assembly of Gavin Jones' clients, staff and other interested parties yesterday, struck a chord when he spoke of Hopkins' attention to detail, involved approach and two inch thick brief.
"So much of what has happened was with the support of John Hopkins" he said. "He made an incredible contribution".
Hopkins who campaigned strongly for a green Games, died aged 59 in America where he worked as a visiting professor at the University of Pennsylvania.
Hossein Ashardi nursery director at Hillier Nurseries wich provided mature trees for the site, also paid tribute. "He was such a lovely guy, not only talented, but a perfect human being."