Although being in position for four months, it was still an eventful stay, with typically Millers-like ups and downs.
Here's a look at some of his highs and lows.
Highs
Getting a first win and revenge
After a tough start to life in the Millers dug-out all eyes were on Redfearn when he made his first return to Elland Road, while it was also a first reunion with former boss Steve Evans for the men in red and white. Despite being denied a car park pass by Massimo Cellino, it was Redfearn who had the last laugh as Joe Newell's second-half header gave the Millers a 1-0 win and the new boss was up and running.
Taming the Tigers
Faced with the prospect of working in B&Q, Redfearn's men responded to a poor defeat against Huddersfield with arguably their best performance since returning to the Championship. They outworked and outfought the Tigers while also playing a high-intensity counter-attacking game. Goals from Lee Frecklington and Joe Newell won it for the Millers and gave them some early Christmas cheer.
A performance to give hope
The Millers gave genuine hope that they could pull away from relegation danger when they played promotion-chasing Brighton off the park in early January. Although the Seagulls were on a poor run, an all-round superb display ended in a 2-0 win through goals from front pairing Danny Ward and Matt Derbyshire. From there, the only way appeared to be up.
Getting the best out GWard
When he came to the club Grant Ward had been a peripheral figure, who was in danger of being sent back to Spurs. However, Redfearn took pleasure in coaching him and put faith in the midfielder by starting him in each of his last 20 games in charge. Ward's progression under Redfearn was striking and it earned him a new deal at Tottenham.
Lows
A home humbling
A horror run of fixtures in Redfearn's first month in charge ended with the visit of Ipswich and just when it looked like it couldn't get any worse, the Millers slumped to a shocking 5-2 defeat. They were 3-0 down at half-time after two Paul Green errors which saw him booed by his own fans, 4-0 down three minutes after the restart and after the briefest of attempts at comeback, Daryl Murphy completed his hat-trick.
Derby-day no-show
The performances had been so much better in the build-up to this Yorkshire derby that there was real hope hat the Millers could win. However, they delivered an utterly abject display and were beaten 2-0 by a poor Huddersfield outfit, who scored a goal in either half. Neil Redfearn infamously told his players to go and work in B&Q if they weren't prepared to work hard for the team after the game.
Flopping when it mattered
With Charlton in free fall and having shipped 11 goals in their previous two away games, a home win was the order of the day for the Millers at the end of January. However, it turned out to be an afternoon from hell as they capitulated to a damaging 4-1 loss. They got back on level terms with the game only 12 minutes old and will have fancied their chances of going on to win but they let in another goal just before half-time and then conceded two more after the break, with Jonson Clarke-Harris missing a penalty in between.
