The experienced forward and winger knows all about getting promotion out of the National League, having done exactly that with Forest Green Rovers in 2017 - one year after play-off final defeat to Shaun Pearson's Grimsby.
Marsh-Brown scored Forest Green Rovers' goal in that defeat, a long-range screamer at Wembley, one of 20 goals in 90 appearances during his stay.
Having previously broken through the ranks at Fulham, and spent time with Oldham Athletic, Yeovil Town and Barnet, Marsh-Brown's next stop was in Wales with Newport County.
He spent 2020 playing in the US Professional Soccer League with Memphis 901, before returning to England with Gloucester City before the National League North was curtailed.
Before joining up with Wrexham, Marsh-Brown earned his 12th and 13th Guyanan international caps, and the former England youth international has scored once for Guyana.
He was thrown straight into the Wrexham line-up, making his debut in the home defeat to Stockport County.