Ben Carroll, the 51-year-old former lawyer and political adviser has just four months until the Victorian election to make a difference.

Carroll, who has confirmed he will make a leadership challenge, was elected to parliament in 2012 and says he has always been ambitious

The former deputy silenced the doubters who questioned if he had the grit to seize the top job. This is how he got here and what he will do now he has replaced Jacinta Allan.