The third listed songwriter of “Rein Me In” alongside Sam Fender and Olivia Dean is Max Wolfgang.
The song began as a Sam Fender composition and was later reworked as a duet with Olivia Dean. Wikipedia’s songwriting credit lists Fender first, Dean second, and Wolfgang third, making Max Wolfgang the requested answer.
Wolfgang is also credited as a producer and songwriter on other contemporary pop and rock recordings, which can make the name easy to confuse with the song’s producers or performers. Joe Atkinson, Markus Dravs, and Adam Granduciel are not the third songwriter listed for this track.
The duet version was released on 20 June 2025 as a new version of the song from Fender’s album People Watching. Dean added a new female perspective and vocal sections to the collaboration.