Dorothy Koomson is a contemporary British novelist of Ghanaian descent, often described as "Britain's biggest selling black author of adult fiction." She was born in 1971 in London, where she spent her formative years before moving to Leeds for her university education at Trinity and All Saints College. She later returned to London to pursue a master's degree in journalism at Goldsmiths University.

Koomson began writing at a young age, completing her first novel, There's A Thin Line Between Love And Hate, at 13. Her passion for storytelling persisted, leading her to pursue a career in journalism while continuing to write fiction in her spare time.

Her published career began with The Cupid Effect in 2003. Her third novel, My Best Friend’s Girl, published in 2006, was a significant success, selling nearly 90,000 copies in its first few weeks and later surpassing 500,000 copies after being selected for the Richard & Judy Summer Reads Book Club. Her fourth novel, Marshmallows for Breakfast, also received acclaim, selling over 250,000 copies.

In 2005, Koomson moved to Australia for two years before returning to England, settling in Brighton. Her love for the seaside town is evident in her works, with many of her stories set in Brighton and its surroundings, complemented by elements of Leeds and South London.

Beyond her novels, Koomson engages with her readers through various social media platforms, sharing insights and updates on her literary journey.