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Mark O'Brien

Open
Azantian Literary Agency·US

Agent profile summary

Represents
graphic novelsyoung adult contemporaryyoung adult science fictionyoung adult fantasyadult romanceadult non-fiction
Looking for
Query Letter, Biography, First 10 Pages
How to submit
QueryManager
View source·Agent page
Needs verification·Last verified: 3 May 2026
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Mark O'Brien is a literary agent at Azantian Literary Agency based in US. Their list focuses on genres including graphic novels, young adult contemporary, and young adult science fiction. Currently open to submissions, with responses usually within 8-12 weeks. Submissions via QueryManager. For current guidelines, check the agent's own submission page linked below.

Age Categories

Adult, Young Adult

Response Time

Usually responds within 8-12 weeks

Notable Clients

Becky Albertalli, Kelly Loy Gilbert, Victoria Aveyard, Ryan La Sala, Lydia Kang, J. Elle, Gabe Cole Novoa, Varian Johnson, Jessica Kim, Sayantani DasGupta

Notes

He does not represent horror, thrillers, picture books, novellas, poetry collections, or stories centering suicide, self-harm, intense violence, or gore.

Other agents at Azantian Literary Agency

Roma Panganiban

Azantian Literary Agency

Open
RepresentsLiterary fiction, upmarket fiction, speculative fiction, fantasy, historical fiction, mystery, narrative non-fiction, cultural history, creative non-fiction, food writing, young adult, middle grade
Looking forShe seeks fresh, unexpected perspectives, particularly from underrepresented communities. She favors character-driven literary fiction that borrows from genre elements, narrative nonfiction that reorients understanding of history and culture, and creative nonfiction that appeals to heart, mind, and humor. For Young Adult she prefers realistic, emotional stories whether contemporary or historical.
How to submitSubmit via Roma's QueryManager form. Include query letter, synopsis, comparable books, and upload first 20 pages for fiction or full proposal for nonfiction. One agent at a time, but can submit to up to three ALA agents if first passes.
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Jennifer Azantian

Azantian Literary Agency

Closed
RepresentsFiction, graphic novels, middle grade, young adult, adult fiction, fantasy, science fiction, historical fantasy, magical realism, psychological horror, literary fiction
Looking forShe is currently only open to graphic novel proposals. She seeks explorations of love, friendship, or familial bonds against fantastic backdrops, obscure retold fairy tales, women and girls in STEM, quirky middle grade, modernized mythologies, psychological horror/thrillers with speculative elements, literary and near-future science fiction, historical fantasy, magical realism, and internally consistent epic fantasy.
How to submitAll ALA agents use Query Manager. Submit to one agent at a time. Include polished query letter, bio, and follow manuscript guidelines: novels submit 10-20 pages, graphic novels submit proposal with 10-20 sample pages and 2-4 full colored pages.
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T.S. Ferguson

Azantian Literary Agency

Open
RepresentsFantasy, horror, middle grade, young adult, graphic novels
Looking forHe seeks hooky and high-concept books with commercial plots, strong craft writing, and compelling characters. He prioritizes underrepresented voices and LGBTQ+ stories. For middle grade, he wants epic adventures and magical stories with series potential. For young adult, he seeks dark stories, atmospheric horror, and unique formats.
How to submitSubmit through Query Manager form with query letter, 10-20 pages for novels, complete manuscript for picture books, and graphic novel proposals with sample pages.
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Shelly Romero

Azantian Literary Agency

Closed
RepresentsHorror, gothic romance, grounded fantasy, thriller, mysteries, commercial fiction, science fiction, speculative fiction, historical fiction, erotic fiction
Looking forShe seeks horror across almost all subgenres and age categories, gothic romance, grounded fantasy, thrillers and mysteries with non-cop protagonists, commercial fiction, science fiction, speculative fiction, historical fiction featuring BIPOC and queer characters, and adult erotic fiction especially featuring BIPOC and LGBTQIA characters. She particularly welcomes stories by Honduran authors and Latine/x authors from Central America and the Caribbean.
How to submitAll ALA agents use Query Manager. Submit to one agent at a time, but if one agent passes, you can submit to up to three agents at ALA. Submit 10-20 polished pages for novels.
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Mara Hollander

Azantian Literary Agency

Open
RepresentsFantasy, romance, mystery, horror, upmarket fiction, commercial fiction, thriller, science fiction, non-fiction
Looking forShe seeks accessibly-written novels that transport readers and make them forget the world around them. She loves deep POV, compelling hooks, and confident voices. She's particularly interested in fantasy, romance, mystery, horror, and upmarket or commercial fiction, especially with speculative elements. In nonfiction, she wants paradigm-shifting, platform-driven books that make readers reconsider what they know about the world.
How to submitSubmit through Query Manager only. Include query letter, bio, and 10-20 polished pages for novels. No email submissions accepted unless requested or on referral.
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Thais Afonso

Azantian Literary Agency

Closed
RepresentsFantasy, science fiction, horror, contemporary romance, mysteries, thriller
Looking forShe intends to represent marginalized authors and is especially seeking to uplift indigenous voices and voices from the Global South. She's particularly keen on growing her contemporary romance, thriller, and horror lists. She's looking for K-drama-style high-stakes romance, queer rivals-to-lovers sports romance, sapphic romantasy, BIPOC vampire horror with social commentary, and sex-positive, kink-positive contemporary romance.
How to submitAll ALA agents use Query Manager. Submit to one agent at a time with a polished query letter, bio, and 10-20 polished pages for novels.
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Agents with overlapping taste

Michelle Witte

Mansion Street Literary Management

Open
RepresentsYoung adult fiction, middle grade fiction, graphic novels, women's fiction, romance, historical fiction, science fiction, fantasy, horror, psychological thriller, narrative nonfiction, biography, culture, social justice, history
Looking forMichelle Witte founded Mansion Street Literary Management and represents MG and YA fiction, graphic novels, adult fiction, and narrative nonfiction. In YA she is looking for rom-com, historical, science fiction and fantasy, horror, psychological thrillers, and mashups of those categories; in MG, fun voices in adventure, contemporary, mystery, humor, horror, speculative, science fiction and fantasy, plus select graphic novels. In adult fiction she seeks women's fiction, romance, and speculative work. For nonfiction she is interested in biographies, culture, social justice, and history with a fresh lens and a personal element.
How to submitSubmit to Michelle Witte through the official QueryManager link on the Mansion Street submissions page. Her form asks for project details, query letter, synopsis, comparable books, AI disclosure, and the first 5 pages or a full proposal for nonfiction. Mansion Street says if you do not hear back within 8 weeks, consider it a pass.
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Tasneem Motala

Belcastro Agency

Closed
RepresentsPoetry, picture books, graphic novels, contemporary fiction, fantasy, science fiction, romance, young adult
Looking forTasneem is looking across categories for work from marginalized authors, especially under the BIPOC umbrella. Interests include genre-inflected poetry, picture books, graphic novels, contemporary MG/YA/adult, fantasy, YA/adult science fiction, and YA/adult romance.
How to submitTasneem is currently closed to queries. The official Belcastro page links her QueryManager route, the linked form says she is closed until further notice, with a separate BIPOC-exclusive form noted there.
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Katrina Lemaire

Corvisiero Literary Agency

Closed
RepresentsHorror, speculative fiction, romantasy, fantasy, gothic, magical realism, contemporary romance, picture books, graphic novels
Looking for#OwnVoices Horror, Speculative, and Romantasy; Horror including body horror, femgore, horror romance, monster horror, folk horror; Gothic romance; Magical Realism; Indigenous/First Nations works; Cozy fantasies; Picture books with climate change and environmental STEAM themes
How to submitSubmit through QueryManager
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Anjanette Barr

Dunham Literary

Closed
RepresentsAdult fiction, adult non-fiction, children's books, historical fiction, literary fiction, upmarket fiction, romance, fantasy, science fiction, biography, memoir, middle grade, young adult, picture books
Looking forIn Adult Fiction she seeks captivating settings and relatable characters that highlight virtues like empathy and self-sacrifice in historical, literary/upmarket, romance, or fantasy/science fiction genres. In Adult Non-fiction she wants well-researched titles that make complex topics accessible, biography and memoir that connect diverse readers, and books about poverty and justice. For children's literature, she loves books that can be read aloud and shared with families, especially middle grade, and seeks books with hopeful, informative, or lyrical tones.
How to submitStarting January 2026, queries must be submitted through QueryManager only. Address your query to the specific agent you think would be the best fit. Only send one query to Dunham Literary as agents share queries with each other when appropriate.
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Natascha Morris

The Tobias Literary Agency

Open
RepresentsFantasy, mystery, horror, speculative fiction, romance, picture books, middle grade, young adult, graphic novels
Looking forShe is primarily looking for bold, emotional narratives with layered characters, lyrical and atmospheric writing, voicey genre-blending tales, big stakes, speculative worlds filled with haunting quietly wondrous magic, sharply funny rom-coms and coming of age narratives, witty and heartfelt picture books, and fearless storytellers tackling big ideas. She loves working with and supporting marginalized authors and their stories.
How to submitSubmit materials via Query Manager.
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Renée Jarvis

Triangle House Literary

Open
RepresentsNarrative nonfiction, speculative fiction, upmarket fiction, literary fiction, children's books, commercial fiction, family saga, fantasy, graphic novels, historical fiction, humor, LGBTQ+, literary middle grade, literary young adult, romance, science fiction, short stories, food, history, journalism, memoir, nature, pop culture, psychology, science, technology
Looking forRenée is seeking narrative nonfiction, adult speculative, upmarket, and literary fiction, and children's books. She is interested in work centering POC and LGBTQIA+ voices and is particularly drawn to Black writers across the African diaspora. Her current QueryManager genres span adult fiction, children's categories, and nonfiction including arts, culture, food, history, journalism, memoir, nature, pop culture, psychology, science, technology, and travel.
How to submitSubmit through Renée Jarvis's QueryManager route. The current form asks for a query letter with bio, synopsis, AI disclosure, and the first 30 pages for fiction or a full proposal for nonfiction.
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This profile was last verified on 3 May 2026. PairPi tracks UK literary agents' submission guidelines against their own websites. If you spot something wrong, please email hello@pairpi.com.