[4] After an extended period in England, which included experience writing for the BBC and some time working, he went to Peterborough, New Hampshire.
On his return to Ghana, Marshall wrote a newspaper column under the nom de plume "Tuli Blanko".
Between 1973 and 2003, Marshall produced four plays and two novels, wrote regularly for the press and worked in the Ghana Television drama department.
[5] Marshall was a Fellow of the Pan African Writers Association (PAWA) Over the decades, his writings were wide and diverse spanning film and television, radio, the press and books.
[3] In 2003, he produced the play The Shadow of an Eagle, engaging mythology and symbolism to explore ideas of personal ambition and fulfillment.