diff --git a/.changeset/organization-nullable-fields.md b/.changeset/organization-nullable-fields.md
new file mode 100644
index 00000000..99b3ce8b
--- /dev/null
+++ b/.changeset/organization-nullable-fields.md
@@ -0,0 +1,7 @@
+---
+'@youversion/platform-core': patch
+---
+
+Fix `OrganizationsClient.getOrganization` rejecting live API responses. The API sends `address: null` for organizations without an address and `description: null` for some, but `OrganizationSchema` only allowed those fields to be omitted, so every lookup threw a validation error. Both fields now accept `null`, and `BibleVersionPicker` now shows publisher names.
+
+The `Organization` `description` and `address` types now include `null`; check for null when you read them. Code that passes these fields where `string | undefined` or `OrganizationAddress | undefined` is expected stops compiling under strict null checks.
diff --git a/packages/core/src/__tests__/MockOrganizations.ts b/packages/core/src/__tests__/MockOrganizations.ts
index ae85e9ef..eb13c90b 100644
--- a/packages/core/src/__tests__/MockOrganizations.ts
+++ b/packages/core/src/__tests__/MockOrganizations.ts
@@ -1,17 +1,44 @@
 import type { Organization } from '../types';
 
+// Shapes mirror live GET /v1/organizations/{id} responses, which send null for absent
+// optional fields rather than omitting them.
 export const mockLockmanOrganization: Organization = {
   id: '798d8fa4-f640-4155-8cfb-fa91d1d8a06c',
+  parent_organization_id: null,
   name: 'The Lockman Foundation',
+  description: 'Publisher of the New American Standard Bible and the Amplified Bible.',
+  phone: null,
   primary_language: 'en',
   website_url: 'https://www.lockman.org',
+  address: null,
 };
 
 export const mockBiblicaOrganization: Organization = {
   id: '05a9aa40-37b6-4e34-b9f1-a443fa4b1fff',
+  parent_organization_id: null,
   name: 'Biblica',
+  description: 'Publisher and translation sponsor of the New International Version.',
+  phone: null,
   primary_language: 'en',
   website_url: 'https://www.biblica.com',
+  address: null,
 };
 
-export const mockOrganizations: Organization[] = [mockLockmanOrganization, mockBiblicaOrganization];
+/** Some live organizations also send `description: null`. */
+export const mockOrganizationWithoutDescription: Organization = {
+  id: '3c6f0a8e-5b2d-4f1e-9a7c-2d8b4e6f1a3c',
+  parent_organization_id: null,
+  name: 'MissionAssist',
+  description: null,
+  email: null,
+  phone: null,
+  primary_language: 'en',
+  website_url: 'https://www.missionassist.org.uk',
+  address: null,
+};
+
+export const mockOrganizations: Organization[] = [
+  mockLockmanOrganization,
+  mockBiblicaOrganization,
+  mockOrganizationWithoutDescription,
+];
diff --git a/packages/core/src/__tests__/organizations.test.ts b/packages/core/src/__tests__/organizations.test.ts
index de150bcb..424a4669 100644
--- a/packages/core/src/__tests__/organizations.test.ts
+++ b/packages/core/src/__tests__/organizations.test.ts
@@ -1,6 +1,18 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import { ApiClient } from '../client';
 import { OrganizationsClient } from '../organizations';
+import { OrganizationSchema } from '../schemas/organization';
+import { mockLockmanOrganization, mockOrganizationWithoutDescription } from './MockOrganizations';
+
+function createOrganizationsClient(): OrganizationsClient {
+  return new OrganizationsClient(
+    new ApiClient({
+      apiHost: process.env.YVP_API_HOST || '',
+      appKey: process.env.YVP_APP_KEY || '',
+      installationId: 'test-installation',
+    }),
+  );
+}
 
 describe('OrganizationsClient', () => {
   let apiClient: ApiClient;
@@ -31,3 +43,27 @@ describe('OrganizationsClient', () => {
     });
   });
 });
+
+it('parses organizations whose address and description arrive as null', async () => {
+  const organizationsClient = createOrganizationsClient();
+
+  // Every live organization sends address: null
+  const lockman = await organizationsClient.getOrganization(mockLockmanOrganization.id);
+  expect(lockman.name).toBe('The Lockman Foundation');
+  expect(lockman.address).toBeNull();
+
+  // Some also send description: null
+  const missionAssist = await organizationsClient.getOrganization(
+    mockOrganizationWithoutDescription.id,
+  );
+  expect(missionAssist.name).toBe('MissionAssist');
+  expect(missionAssist.description).toBeNull();
+});
+
+it('accepts null only for address and description, keeping the other fields strict', () => {
+  const organization = { ...mockLockmanOrganization, address: null, description: null };
+  expect(OrganizationSchema.safeParse(organization).success).toBe(true);
+
+  expect(OrganizationSchema.safeParse({ ...organization, name: null }).success).toBe(false);
+  expect(OrganizationSchema.safeParse({ ...organization, website_url: null }).success).toBe(false);
+});
diff --git a/packages/core/src/schemas/organization.ts b/packages/core/src/schemas/organization.ts
index 28bf85b6..99b2c183 100644
--- a/packages/core/src/schemas/organization.ts
+++ b/packages/core/src/schemas/organization.ts
@@ -42,8 +42,12 @@ export const OrganizationSchema = z.object({
    * used. The chosen language is returned in the Content-Language header.
    */
   name: z.optional(z.string()),
-  /** Description of the organization: its purpose, goals, values, and mission. */
-  description: z.optional(z.string()),
+  /**
+   * Description of the organization: its purpose, goals, values, and mission.
+   * The API sends null when there is none. The OpenAPI spec does not mark it nullable yet
+   * (YPE-6438).
+   */
+  description: z.optional(z.nullable(z.string())),
   /** The contact email address for the organization if provided. */
   email: z.optional(z.nullable(z.string())),
   /** The contact phone number for the organization if provided. */
@@ -52,8 +56,11 @@ export const OrganizationSchema = z.object({
   primary_language: z.optional(z.string()),
   /** The web site for the organization. */
   website_url: z.optional(z.string()),
-  /** The organization's address. */
-  address: z.optional(OrganizationAddressSchema),
+  /**
+   * The organization's address. The API sends null when there is none. The OpenAPI spec
+   * does not mark it nullable yet (YPE-6438).
+   */
+  address: z.optional(z.nullable(OrganizationAddressSchema)),
 });
 
 export type Organization = Readonly<z.infer<typeof OrganizationSchema>>;
diff --git a/packages/ui/src/components/bible-version-picker.stories.tsx b/packages/ui/src/components/bible-version-picker.stories.tsx
index 5c8218a4..3e0f4071 100644
--- a/packages/ui/src/components/bible-version-picker.stories.tsx
+++ b/packages/ui/src/components/bible-version-picker.stories.tsx
@@ -526,6 +526,31 @@ export const InteractiveVersionSearch: Story = {
   },
 };
 
+export const PublisherNames: Story = {
+  args: {
+    versionId: 111,
+  },
+  tags: ['integration'],
+  play: async ({ canvasElement }) => {
+    const canvas = within(canvasElement);
+
+    // Open popover
+    const trigger = await canvas.findByRole('button', { name: /NIV/i }, { timeout: 10_000 });
+    await userEvent.click(trigger);
+
+    // The organization mocks send null fields like the live API, so the publisher name
+    // shows only if core parses those responses
+    const row = await screen.findByRole(
+      'listitem',
+      { name: /new international version 2011/i },
+      { timeout: 5_000 },
+    );
+    await expect(
+      await within(row).findByText('Biblica', {}, { timeout: 5_000 }),
+    ).toBeInTheDocument();
+  },
+};
+
 export const RealAPI: Story = {
   args: {
     versionId: 111,
diff --git a/packages/ui/src/test/mock-data/organizations.json b/packages/ui/src/test/mock-data/organizations.json
index 7a184694..4cfab1c0 100644
--- a/packages/ui/src/test/mock-data/organizations.json
+++ b/packages/ui/src/test/mock-data/organizations.json
@@ -1,26 +1,46 @@
 {
   "05a9aa40-37b6-4e34-b9f1-a443fa4b1fff": {
     "id": "05a9aa40-37b6-4e34-b9f1-a443fa4b1fff",
+    "parent_organization_id": null,
     "name": "Biblica",
+    "description": "Publisher and translation sponsor of the New International Version.",
+    "email": null,
+    "phone": null,
     "primary_language": "en",
-    "website_url": "https://www.biblica.com"
+    "website_url": "https://www.biblica.com",
+    "address": null
   },
   "798d8fa4-f640-4155-8cfb-fa91d1d8a06c": {
     "id": "798d8fa4-f640-4155-8cfb-fa91d1d8a06c",
+    "parent_organization_id": null,
     "name": "The Lockman Foundation",
+    "description": "Publisher of the New American Standard Bible and the Amplified Bible.",
+    "email": null,
+    "phone": null,
     "primary_language": "en",
-    "website_url": "https://www.lockman.org"
+    "website_url": "https://www.lockman.org",
+    "address": null
   },
   "f2ac19b4-768c-4564-acaf-f28724235ad0": {
     "id": "f2ac19b4-768c-4564-acaf-f28724235ad0",
+    "parent_organization_id": null,
     "name": "Artists for Israel International",
+    "description": "Publisher of the Tree of Life Version.",
+    "email": null,
+    "phone": null,
     "primary_language": "en",
-    "website_url": "https://www.afii.org"
+    "website_url": "https://www.afii.org",
+    "address": null
   },
   "f819451a-bc31-4037-b4bd-0c4aa00fe0f6": {
     "id": "f819451a-bc31-4037-b4bd-0c4aa00fe0f6",
+    "parent_organization_id": null,
     "name": "Cambridge University Press",
+    "description": null,
+    "email": null,
+    "phone": null,
     "primary_language": "en",
-    "website_url": "https://www.cambridge.org/bibles"
+    "website_url": "https://www.cambridge.org/bibles",
+    "address": null
   }
 }