diff --git a/apps/web/__tests__/ai-meeting-briefing.test.ts b/apps/web/__tests__/ai-meeting-briefing.test.ts
index 8184569142..81a86430fb 100644
--- a/apps/web/__tests__/ai-meeting-briefing.test.ts
+++ b/apps/web/__tests__/ai-meeting-briefing.test.ts
@@ -51,9 +51,12 @@ function getMeetingBriefingData(
 }
 
 describe("buildPrompt", () => {
+  const mockEmailAccount = getEmailAccount({ timezone: "America/New_York" });
+  const mockEmailAccountNoTz = getEmailAccount({ timezone: null });
+
   test("builds prompt with meeting title and description", () => {
     const data = getMeetingBriefingData();
-    const prompt = buildPrompt(data, "America/New_York");
+    const prompt = buildPrompt(data, mockEmailAccount);
 
     expect(prompt).toContain("Product Discussion");
     expect(prompt).toContain("Q1 roadmap");
@@ -63,7 +66,7 @@ describe("buildPrompt", () => {
     const data = getMeetingBriefingData({
       externalGuests: [{ email: "bob@company.com", name: "Bob Smith" }],
     });
-    const prompt = buildPrompt(data, null);
+    const prompt = buildPrompt(data, mockEmailAccountNoTz);
 
     expect(prompt).toContain("bob@company.com");
     expect(prompt).toContain("Bob Smith");
@@ -75,7 +78,7 @@ describe("buildPrompt", () => {
       emailThreads: [],
       pastMeetings: [],
     });
-    const prompt = buildPrompt(data, null);
+    const prompt = buildPrompt(data, mockEmailAccountNoTz);
 
     expect(prompt).toContain("<no_prior_context>");
     expect(prompt).toContain("New Contact");
@@ -99,7 +102,7 @@ describe("buildPrompt", () => {
         },
       ],
     });
-    const prompt = buildPrompt(data, null);
+    const prompt = buildPrompt(data, mockEmailAccountNoTz);
 
     expect(prompt).toContain("<recent_emails>");
     expect(prompt).toContain("Partnership proposal");
@@ -121,7 +124,7 @@ describe("buildPrompt", () => {
       externalGuests: [{ email: "alice@external.com", name: "Alice External" }],
       pastMeetings: [pastMeeting],
     });
-    const prompt = buildPrompt(data, "America/New_York");
+    const prompt = buildPrompt(data, mockEmailAccount);
 
     expect(prompt).toContain("<recent_meetings>");
     expect(prompt).toContain("Initial Discussion");
@@ -134,7 +137,7 @@ describe("buildPrompt", () => {
         { email: "bob@acme.com", name: "Bob Jones" },
       ],
     });
-    const prompt = buildPrompt(data, null);
+    const prompt = buildPrompt(data, mockEmailAccountNoTz);
 
     expect(prompt).toContain("alice@acme.com");
     expect(prompt).toContain("Alice Smith");
diff --git a/apps/web/utils/ai/meeting-briefs/generate-briefing.test.ts b/apps/web/utils/ai/meeting-briefs/generate-briefing.test.ts
index 3415af4a36..aec363135d 100644
--- a/apps/web/utils/ai/meeting-briefs/generate-briefing.test.ts
+++ b/apps/web/utils/ai/meeting-briefs/generate-briefing.test.ts
@@ -10,6 +10,16 @@ vi.mock("@/env", () => ({
 }));
 vi.mock("@/utils/llms/model", () => ({ getModel: vi.fn() }));
 vi.mock("@/utils/llms", () => ({ createGenerateObject: vi.fn() }));
+vi.mock("@/utils/ai/helpers", () => ({
+  getUserInfoPrompt: vi.fn(
+    ({ emailAccount }) =>
+      `The user you are acting on behalf of is:
+<user_info>
+<email>${emailAccount.email}</email>
+<about>${emailAccount.about}</about>
+</user_info>`,
+  ),
+}));
 vi.mock("@/utils/stringify-email", () => ({
   stringifyEmailSimple: vi.fn(
     (email) =>
@@ -27,12 +37,18 @@ vi.mock("@/utils/get-email-from-message", () => ({
 vi.doUnmock("@/utils/date");
 
 import { buildPrompt } from "./generate-briefing";
+import type { EmailAccountWithAI } from "@/utils/llms/types";
 
 beforeEach(() => {
   vi.clearAllMocks();
 });
 
 describe("buildPrompt timezone handling", () => {
+  const mockEmailAccount = {
+    email: "user@company.com",
+    timezone: "America/Sao_Paulo",
+    about: "I am a product manager at Company Inc.",
+  } as EmailAccountWithAI;
   it("formats past meeting times in the user's timezone (not UTC)", () => {
     // This test documents the timezone bug fix:
     // - Calendar API stores times in UTC
@@ -54,6 +70,7 @@ describe("buildPrompt timezone handling", () => {
         ],
       },
       externalGuests: [{ email: "client@acme.com", name: "John Smith" }],
+      internalTeamMembers: [],
       emailThreads: [],
       pastMeetings: [
         {
@@ -67,12 +84,18 @@ describe("buildPrompt timezone handling", () => {
       ],
     };
 
-    const prompt = buildPrompt(briefingData, "America/Sao_Paulo");
+    const prompt = buildPrompt(briefingData, mockEmailAccount);
 
     // The past meeting should show "4:00 PM" (Brazil time), NOT "7:00 PM" (UTC)
     expect(prompt).toMatchInlineSnapshot(`
       "Prepare a concise briefing for this upcoming meeting.
 
+      The user you are acting on behalf of is:
+      <user_info>
+      <email>user@company.com</email>
+      <about>I am a product manager at Company Inc.</about>
+      </user_info>
+
       <upcoming_meeting>
       Title: Strategy Review
       Description: Discuss Q1 roadmap
@@ -117,15 +140,22 @@ describe("buildPrompt timezone handling", () => {
         ],
       },
       externalGuests: [{ email: "newcontact@other.com", name: "New Person" }],
+      internalTeamMembers: [],
       emailThreads: [],
       pastMeetings: [],
     };
 
-    const prompt = buildPrompt(briefingData, "America/Sao_Paulo");
+    const prompt = buildPrompt(briefingData, mockEmailAccount);
 
     expect(prompt).toMatchInlineSnapshot(`
       "Prepare a concise briefing for this upcoming meeting.
 
+      The user you are acting on behalf of is:
+      <user_info>
+      <email>user@company.com</email>
+      <about>I am a product manager at Company Inc.</about>
+      </user_info>
+
       <upcoming_meeting>
       Title: Intro Meeting
 
diff --git a/apps/web/utils/ai/meeting-briefs/generate-briefing.ts b/apps/web/utils/ai/meeting-briefs/generate-briefing.ts
index da80bf6c56..473e624f58 100644
--- a/apps/web/utils/ai/meeting-briefs/generate-briefing.ts
+++ b/apps/web/utils/ai/meeting-briefs/generate-briefing.ts
@@ -7,6 +7,7 @@ import { env } from "@/env";
 import { getModel } from "@/utils/llms/model";
 import { createGenerateText } from "@/utils/llms";
 import type { EmailAccountWithAI } from "@/utils/llms/types";
+import { getUserInfoPrompt } from "@/utils/ai/helpers";
 import type { CalendarEvent } from "@/utils/calendar/event-types";
 import type { MeetingBriefingData } from "@/utils/meeting-briefs/gather-context";
 import { stringifyEmailSimple } from "@/utils/stringify-email";
@@ -94,7 +95,7 @@ export async function aiGenerateMeetingBriefing({
     );
   }
 
-  const prompt = buildPrompt(briefingData, emailAccount.timezone);
+  const prompt = buildPrompt(briefingData, emailAccount);
   const modelOptions = getModel(emailAccount.user);
 
   const generateText = createGenerateText({
@@ -342,7 +343,7 @@ function createWebSearchTool({
 // Exported for testing
 export function buildPrompt(
   briefingData: MeetingBriefingData,
-  timezone: string | null,
+  emailAccount: EmailAccountWithAI,
 ): string {
   const { event, externalGuests, emailThreads, pastMeetings } = briefingData;
 
@@ -354,7 +355,7 @@ export function buildPrompt(
       name: guest.name,
       recentEmails: selectRecentEmailsForGuest(allMessages, guest.email),
       recentMeetings: selectRecentMeetingsForGuest(pastMeetings, guest.email),
-      timezone,
+      timezone: emailAccount.timezone,
     }),
   );
 
@@ -376,6 +377,8 @@ export function buildPrompt(
 
   const prompt = `Prepare a concise briefing for this upcoming meeting.
 
+${getUserInfoPrompt({ emailAccount })}
+
 <upcoming_meeting>
 Title: ${event.title}
 ${event.description ? `Description: ${event.description}` : ""}