aid: callisto-media
name: Callisto Media
description: 'Callisto Media Inc. was a data-driven nonfiction book publisher founded
  in 2011 by chief executive Benjamin Wayne, operating from 1955 Broadway in Oakland,
  California (earlier Emeryville) and 220 West 19th Street in New York. It built a
  publishing model around demand signals rather than editorial instinct — mining point-of-sale
  data, search volume and category gaps to decide which instructional titles to commission,
  then matching each topic to a subject-matter author. Its primary imprint was Rockridge
  Press, best known for diet-, appliance- and condition-specific cookbooks and health
  titles, alongside the Callisto Kids line of pre-K through grade 12 workbooks, STEM,
  history and biography titles; the company said it had reached more than 50 million
  customers and ranked among the top fifteen US publishers by unit sales. It raised
  venture funding from 137 Ventures in 2017, then contracted sharply — cutting 35 percent
  of staff in July 2022 and a further 200 roles that October — and on 9 May 2023 its
  publishing assets were acquired by the independent publisher Sourcebooks in a deal
  funded by Penguin Random House, with Simon & Schuster Distribution Services continuing
  to distribute the titles. The brand now trades as Callisto Publishing, a Sourcebooks
  imprint: callistomedia.com 301-redirects to callistopublishing.com, which 301-redirects
  again to sourcebooks.com/callisto (chain verified 2026-08-02). Callisto Media is
  a consumer publishing business, not a software vendor, and has no public API surface.
  Probes on 2026-08-02 against callistomedia.com, www.callistopublishing.com and www.sourcebooks.com
  returned no machine-readable contract: /openapi.json, /swagger.json and /.well-known/ai-plugin.json
  all 404, /.well-known/agent-card.json and /.well-known/agent.json both 404 (no A2A
  agent card), and every other probed path answered with the Sourcebooks single-page
  Magento storefront shell rather than a document. There is no developer portal, no
  GitHub organization (callistomedia, callisto-media and rockridgepress all 404 on
  the GitHub API), no published SDK on npm or PyPI, and no llms.txt.'
image: https://web.archive.org/web/20230316111229im_/https://www.callistomedia.com/content/uploads/2018/12/logo-2.png
url: https://raw.githubusercontent.com/api-evangelist/callisto-media/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-secondary-market-listing: https://forgeglobal.com/callisto-media_stock/
x-archived-website: https://web.archive.org/web/20230316111229/https://www.callistomedia.com/
x-successor: Callisto Publishing, an imprint of Sourcebooks (assets acquired 2023-05-09)
x-tier: stub
x-tier-reason: no-public-api-surface
x-enrichment:
  date: '2026-08-02'
  status: minimal
  artifacts_added: 3
  pass: local-v1
specificationVersion: '0.20'
created: '2026-08-02'
modified: '2026-08-02'
tags:
- Company
- Publishing
- Book Publishing
- Educational Publishing
- Children's Books
- Nonfiction
- Media
- Consumer Products
- Data-Driven Publishing
- Acquired
- United States
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/callisto-media-domain-security.yml
- type: WellKnown
  url: well-known/callisto-media-well-known.yml
- type: LLMsTxt
  url: llms/callisto-media-llms.txt
- type: Website
  url: https://www.sourcebooks.com/callisto/
- type: LinkedIn
  url: https://www.linkedin.com/company/callisto-media
- type: Crunchbase
  url: https://www.crunchbase.com/organization/callisto-media
- type: Press
  url: https://www.prnewswire.com/news-releases/callisto-media-to-join-leading-independent-publisher-sourcebooks-301820039.html
- type: SecondaryMarket
  url: https://forgeglobal.com/callisto-media_stock/