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Johanna V. Castillo

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Writers House·US

Agent profile summary

Represents
literary fictioncommercial fictionmemoirnarrative nonfictionyoung adultgraphic novels
+3 morepicture bookslatinx voicesafrican-american voices
Looking for
Johanna is a senior agent at Writers House. Public profiles describe her as building a list across literary and commercial fiction, memoir, narrative nonfiction, YA fiction, graphic novels, and picture books, with interest in diverse voices, particularly Latinx and African-American writers.
How to submit
Writers House asks writers to email an individual agent with a query letter, credentials, what makes the book unique, a synopsis, and 10 pages in the body of the email. Writers should consult the agent's individual profile for any specific requirements and should not query two Writers House agents simultaneously.
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Last checked 8 Jul 2026·Last verified: 8 Jul 2026
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Johanna V. Castillo is a literary agent at Writers House based in US. Their list focuses on genres including literary fiction, commercial fiction, and memoir. Check the official source for current submission availability, with response guidance listed as Writers House says it generally responds to queries within six to eight weeks.. Submissions via Email. For current guidelines, check the agent's own submission page linked below.

Age Categories

Adult, Young Adult, Children's, Picture Books

Response Time

Usually responds within Writers House says it generally responds to queries within six to eight weeks.

Notable Clients

Isabel Allende, Rachael Ray, Sara Shepard, Reyna Grande, Colleen Hoover, Javier Sierra, Laura Esquivel

Related agents

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literary fictioncommercial fictionnarrative non-fictionmemoirchildren'syoung adult (ya)illustrated / picture booksgraphic novels

This profile was last verified on 8 Jul 2026. PairPi tracks UK literary agents' submission guidelines against their own websites. If you spot something wrong, please email hello@pairpi.com.