Adcock joined nbn in November 2013 and led the network design and deployment activities including establishing a new industry partnership model and contract management framework.

He will move into an advisory role reporting direct to the Chief Executive Officer until his departure.

No reason has been given for Adcock’s intention to leave after less than two years but he is understood to want to pursue new challenges elsewhere.

Peter Ryan, previously Executive General Manager Regional Deployment at the NBN, will take up an interim role leading the Network Engineering and Deployment function while a search is undertaken for a permanent replacement for Greg Adcock.

nbn Chief Executive Officer, Bill Morrow, said Greg Adcock joined nbn nearly two years ago “at a time when the network build was facing substantial challenges.”

“Over the last two years, Greg has led the successful rebuilding of our delivery partner relationships, the stabilising and ramping up of the FTTP build program, the kickstart of the FTTN build, and the launch of our first satellite.

“We appreciate Greg's contributions in advancing nbn and helping the company overcome many of the challenges it was facing in network delivery.

“Greg leaves the Network Engineering and Deployment team with strong leaders, ready to scale and accelerate the build of the nbn network.”

On his time at nbn, Adcock said: "I am pleased to have been a part of the leadership team driving the progress made over the last two years. I can’t thank the nbn team enough for their focus and dedication and I will watch their continued progress with pride.”