Date of birth
The Millers swooped for the highly-rated operator during the close season, paying Falkirk an undisclosed fee for his services.
The former Tranmere Rovers youngster has made his name north of the border after a short spell in England with Workington Town.
In a three-year spell at the Falkirk Stadium, he has played over 100 games for the Bairns before moving back to England to sign for the Millers.
Vaulks played against the Millers during a previous pre-season tour of Scotland, but now moves to South Yorkshire looking to make his mark in The Championship.