Diego Harrison is a junior agent at SBR Media with 15 years of publishing-industry experience who hunts for high-concept, voice-driven commercial fiction — particularly horror, thriller, romance, cozy mystery, and military action — while also welcoming YA, middle grade, and select nonfiction.
In brief
Harrison's submission form was directly observed as closed on 2026-03-29 — verify the live form before querying; this is the single most important thing to confirm.
He is deeply genre-fluent and commercially minded, positioning himself as a deal-maximizer rather than a purely literary champion — expect a focus on career-building and rights strategy, not just placement.
His wishlist is unusually self-aware about market saturation: he publicly signals that fantasy/sci-fi and romantasy are oversupplied and he is near-closed on both, which is rare candor that writers should take seriously.
Picture books are only accepted with finished artwork — he will not evaluate text alone, making this a hard gate for writer-only picture book submissions.
His stated passions (horror, domestic thriller, cozy mystery, military action/thriller) form a tight commercial-fiction cluster where he will put the most energy — writers in those lanes have the clearest path to his interest.
Lately
Harrison has publicly flagged that fantasy and sci-fi submissions are so plentiful that he considers himself essentially closed to the genre unless a project is truly exceptional — a notably candid market-saturation warning directed at querying writers.
What Diego is looking for
Horror is one of Harrison's top priorities and the category where his enthusiasm is most evident. He wants visceral, atmospheric work that earns genuine dread — specific setting, sharp dialogue, and a concept strong enough to pull him in and keep the lights on. Zombie fiction is a particular draw. Flat or generic horror will not move him; he needs to feel the world.
Harrison actively searches for domestic thrillers and crime thrillers and describes them as gaps he has yet to fill — a signal that strong queries here get a real look. He strongly prefers contemporary settings; period thrillers are a harder sell unless the historical frame is clearly essential to the story. Paranormal elements or time-travel mechanics are not welcome in this category. A high-concept pitch is non-negotiable.
Harrison cites the Gray Man series, the Jack Reacher series, and the Orphan X series as direct touchstones — fast-paced, protagonist-driven action with a masculine thriller sensibility. He is openly hungry for something that fits alongside those franchises. Writers in this lane who can match that pace and concept clarity have a motivated reader.
Harrison has a personal investment in romance — he is married to a romance author — and it shows in the specificity of his tastes. He welcomes funny, warm romantic comedies as much as dark, atmospheric romance. Character growth and a well-developed relationship arc are requirements, not bonuses. Romantic suspense is also on his list, though he emphasizes it demands precise tonal balance: the suspense and romance must be woven together with real craft.
Cozy mystery is a declared favorite — the cozier the better, by his own description. Writers crafting gentle, community-centered whodunits with charm and warmth should lead with that framing. He also enjoys detective fiction broadly, but has a preference for present-day settings and contemporary law-enforcement or investigator protagonists (active or retired cops, FBI, PIs) over historical or period mysteries.
Harrison welcomes YA across genres but holds it to a high bar for originality — if the pitch sounds like every other YA query he has seen, it will not stand out. Authenticity of character voice is paramount: the protagonist must genuinely read as a teenager, not an adult in a younger body. Originality of concept is the differentiator in this crowded space.
He accepts middle grade but will read closely for authentic kid voice. Writing that sounds too adult in its diction or sensibility is a quick pass. Writers should read widely in published MG before submitting to calibrate the register correctly.
Nonfiction and memoir are accepted, but Harrison requires a properly constructed nonfiction proposal with full front matter — queries without this infrastructure will not advance. Sports nonfiction and true crime are listed subject areas. No platform or proposal shortcutting.
Harrison will consider picture books, but finished artwork is a hard requirement — he will not evaluate text manuscripts submitted without illustrations. This gate effectively closes the category to writers who are not also illustrators or who do not already have a completed illustrated package.
Harrison describes this as a heavily saturated market and states plainly that he is essentially closed to submissions here — he will only consider something genuinely exceptional. Writers querying in this space must bring extraordinary writing quality and a high-concept pitch that distinguishes the project from the flood. Treat this as a near-closed category unless the project is undeniably singular.
Romantasy is flagged as increasingly overbought. Harrison has had success in the category but is becoming more selective. A high-concept pitch and exceptional prose execution are the minimum to get a read. Generic romantic fantasy with familiar tropes and no distinguishing hook will not make the cut.
Not the right fit
Taste fingerprint
How to query Diego
Confirm the submission form is currently open before investing time in a query — it was observed closed on 2026-03-29 and may reopen without broad announcement.
Lead with a high-concept pitch: Harrison explicitly requires this and defines it as substantive — a teaser that withholds plot details is a fast pass. The pitch should have real story meat: stakes, hook, conflict.
Prepare your manuscript to professional standards before submitting: double-spaced, proper headers, grammar-checked, and self-edited for repeated words, repeated phrases, and monotonous sentence openings. He names these specifically as red flags.
Match your query to his heat level: horror, domestic thriller, military action, romance, and cozy mystery are where he has the most appetite — lead with the genre clearly and let him place you in the right mental category immediately.
If submitting a picture book, your query must include finished artwork. Text-only picture book submissions are explicitly rejected.
If submitting nonfiction or memoir, include a properly structured proposal with front matter — do not substitute a cover letter or synopsis for this.
Avoid framing a thriller as paranormal or time-travel adjacent; he specifically excludes these from his thriller preferences.
For middle grade submissions, read recently published MG to calibrate authentic child voice — he will test this on the page.
Do not query fantasy or sci-fi unless the project is genuinely exceptional by any standard — he is candid that the category is effectively closed to ordinary submissions.