Margaret McCarthy's stage plays use  the heightened language of her poetry as their basis.

The Sacrificial King: A Play for John Lennon  was given a New York City showcase production by The World 3 Theatre Company.  Prior to that, it was given staged readings at The English Speaking Union in New York City and at Duke University, N.C.  Its 2009 production at John Hancock Theatre, Boston, as part of The Boston Globe sponsored Massachusetts High School Drama Guild (MHSDG) Festival took festival awards. 

Her stage play, Deirdre Retrograde is based on her own cycle of poems about the heroine of Irish myth. It resulted from McCarthy’s ongoing involvement with the literature of Celtic myth, which has been a continual source of inspiration for her creative work. The play was read at La Mama Theatre, NYC, as part of its Experiments Reading Series.

She is a member of The Dramatists Guild of America and PEN USA.

McCarthy's poetry has appeared in numerous literary magazines, journals and anthologies including: The Pagan Muse:Poems of Ritual and Inspiration,  Working Papers in Irish Studies, Gargoyle Magazine, Shaking Like A Mountain: On line Literature about Contemporary Music, Poetry New Zealand,  California State Poetry Society Quarterly, O!!ZONE,  Xanadu,  Caprice , Matrix,  The Poet,  Poets and Peace International,  Voices International,  Encore, Visions of the Enchanted Spirit, Nit & Wit Literary Magazine and The New Earth Review.  McCarthy has also reviewed for Groundswell MagazineNew Directions for Women and The Chiron Review.

McCarthy has read her work at a variety of venues in the New York area, including WNYC FM's "Poetry in the Morning".

She has received fellowships as a playwright, poet and photographer form The Virginia Center for the Creative Arts, The Ragdale Foundation and The Hambidge Center.

She works as a professional photographer in New York City; her landscape photographs and images based on Celtic myth have been widely exhibited.

Her recent venture A VISION AND A VERSE combines her imagery and poetry as an electronic broadside.

Margaret McCarthy is a member of The Dramatists Guild