B.A. Markus started her professional writing career as a columnist for "Eye Weekly" entertainment magazine in Toronto while finishing her Masters' degree at U of T. Her first play "She He" won Victoria's Belfry Theatre's one-act play competition and she continued writing for theatre eventually creating three interactive musical productions for young audiences that she performed across Canada. When she moved to Montreal she met and began collaborating with musicians on the blues and jazz scene both in Montreal and internationally. These musicians include Michael Jerome Browne, Eric Bibb and Bob Walsh. Her lyrics are award-winning, Grammy and Juno nominated and heard around the world on both public and commercial radio.

 In 2014 she won the Carte Blanche Creative Nonfiction Collective Prize for her essay "On Good Days". In 2018 she won the Malahat Review's Creative Nonfiction prize for her essay, "How Can a Dog Help a Goose?"She has been short-listed for the CBC/QWF fiction prize twice and long-listed for the CBC Creative Nonfiction prize once.

Her fiction and nonfiction work can be found in publications and anthologies including Queen's Quarterly, Carte Blanche, In the Company of Animals and most recently in Inanna Press' Writing Menopause. She tells true stories at Montreal's Confabulation Storytelling events and at Yarn. She teaches English and storytelling in Montreal.

In 2022 she collaborated with classical composer Jason Noble to create the libretto “Denise.” That year she also received a grant to create a podcast with Michael Jerome Browne entitled: The Roots Encyclopedia. In 2023 she received a $25,000 grant from the Canada Council of the Arts and to create and produce a site specific theatre project entitled WMN3X3 that features nine actors performing original monologues that explore themes around maternal resilience and maternal survival. Using elements of visual art, music, and humour, her work consistently explores themes of survival and inheritance, topics that profoundly resonate with the artist as the youngest daughter of a genocide survivor.