Williamson (22) was a runaway winner in the junior drivers' premiership in the 2015-16 season with 70 wins, 31 clear of Kyle Marshall in second.
He joins brother Matthew (2012-13 season) as a winner of the juniors' title.
"Mark Purdon and the likes were getting awards so it's good to be able to have a small moment with people like that to be recognised for doing something,'' Williamson said.
The junior drivers' premiership was all but over as a contest once the Central Otago circuit wrapped up in January.
He returned to drive at a meeting on January 7 with 33 wins already in the bag, more than double the closest chasers had at that time.
"It all worked out well in the end. I was a long way clear pretty early on, so we were able to cruise through the last six months of the season,'' he said.
Williamson was always going to target the 2015-16 season for a dab at the premiership, as it was his last season in the junior ranks, and early success confirmed his decision, along with help from father Phil and brother Matthew.
"I had always wanted to win one and it was my last year, so I had to try and make a go of it,'' he said.
"I was four or five wins ahead straight away after the first six weeks, and that's when Matt decided he was OK with me getting the choice of the team which he had for the last four or five years. So it was good to be able to have a season where I could drive pretty much what I wanted to out of Dad's horses.''
Aside from his 43 wins for his father, Williamson also had support from Invercargill trainer Alister Black, who provided Williamson with five wins, along with plenty of catch drives in junior drivers' races.
Williamson will take stock over the next 12 to 24 months before working out his next move in the industry.
"I bought a property [in Totara] through the year and I've been pretty pleased with that purchase, so I'll just look after that,'' he said.
"I won't be driving as many horses for Dad this year and my wins will dramatically decrease. But I'll just play it by ear. I haven't really got anything set in concrete, but I plan on working for Dad for the next year or two then have a bit of a summary after that and see what opportunities I can get.''
Williamson will drive across the lower half of the South Island but expects to drive south of Oamaru more than north.
"There is a bit of a shortage in the open-class driving ranks in Southland so that's probably where I will find myself getting more drives.''
