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Johanna V. Castillo

An agent with Writers House LLC (see other agents at this agency).

About

Johanna Castillo is a Senior Agent at Writers House Literary Agency. A seasoned professional in the publishing industry, Johanna was formerly Vice President & Executive Editor at Atria Books/Simon and Schuster and Editorial Director of Atria Español for nearly fifteen years. In that role, she acquired and edited forty-one New York Times bestsellers by multiple national and international bestselling authors including Isabel Allende, Rachael Ray, Sara Shepard, Javier Sierra, Laura Esquivel, Felix J. Palma, and María Dueñas. While at Atria Books, Johanna edited #1 New York Times bestseller It Ends With Us by Colleen Hoover, as well as 14 of her other titles, including Ugly Love, November 9 and others. She has been featured in The Miami Herald, The Boston Globe, The Daily News, and in Publishers Weekly. She was featured as a “Mujer on the Move” by Latina magazine, named a 2005 Prominent Latina by El Diario La Prensa, and was named one of the 25 Most Powerful Women by People en Español magazine in 2016. She is also a board member of the Board of Directors of Poets & Writers. As a literary agent, Johanna is actively building a list of talented authors with whom she can work closely editorially and form solid, long-term partnerships. Johanna is seeking works of Literary and commercial fiction, memoir and narrative non-fiction. She is always seeking new diverse voices particularly Latinx and African-American.

Country

United States

AI Policy

Unknown AI policy

Collapse section Fiction Open

Audience:

Open to a broad Audience, including: Adults, Young adults, All ethnic groups/populations, Blacks/People with African origins, Hispanics/Latinos.

Genres:

General Open to all/most Subgenres, including: Historical, Women's Fiction
Romance Subgenre: Chick Lit
Suspense/Thriller Open to all/most Subgenres

Lengths:

Novel

Styles:

Open to all/most Styles, including: Literary, Mainstream.

Topics:

Open to all/most Topics including...
Society/Culture: Ethnicity/Race.

Submissions:

Method: Email.
Simultaneous submissions: Simultaneous submissions are allowed.

Collapse section Nonfiction Open

Audience:

Open to a broad Audience, including: Adults, All ethnic groups/populations, Blacks/People with African origins, Hispanics/Latinos.

Lengths:

Book

Styles:

Open to all/most Styles, including: Literary, Mainstream, Personal.

Topics:

Open to all/most Topics including...
Lifestyle: Cooking, Mind-body-spirit, Self-help.
Memoir.
Society/Culture: Ethnicity/Race, Pop culture.

Submissions:

Method: Email.
Simultaneous submissions: Simultaneous submissions are allowed.

Always check guidelines for details and restrictions. If you aren't familiar with these terms, see our glossary.

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A legitimate agent will not contact you and request money to represent you. Never pay an agent an up-front fee. That is not how literary agent representation works. Agents earn a commission only after they've landed a publishing deal for you. Also, agents scarcely ever contact writers. If an agent that you haven't queried contacts you about representation, be suspicious. Look up the agent and check if the email address is correct for that agent/agency.

Johanna V. Castillo Submission Statistics

The statistics in this section are compiled from submission reports sent to us through our submission tracker. They are not provided by the agency or by Duotrope's admins. Information in this section is updated a few times per day. Learn more about the statistics.

We have not received any submission reports for this listing in the past 12 months.

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Before Submitting

We cannot guarantee that the information on this page is correct. We do our best to keep up, but it isn't always possible. Duotrope listings do not imply endorsement or recommendation of the agent or agency being listed. Before submitting, you should use your own judgment to determine whether the agent/agency meets your standards.

  • Always read the full guidelines provided by the agency/agent.
  • Unless the agency's guidelines state otherwise, always use industry standard manuscript formatting.
  • For agency submissions, it is standard to submit a query letter and sample instead of the full manuscript. Do this unless otherwise instructed.
  • Be professional, patient, and persistent.

Dates

Last Updated: 05 Jul 2026

We check their guidelines for changes every four weeks, and we audit the listing twice a year.

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