diff --git a/src/graphql/__tests__/util.js b/src/graphql/__tests__/util.js
index 2d912765..110e61c5 100644
--- a/src/graphql/__tests__/util.js
+++ b/src/graphql/__tests__/util.js
@@ -120,6 +120,7 @@ if (process.env.GCS_BUCKET_NAME) {
         createdAt,
         // eslint-disable-next-line no-unused-vars
         updatedAt,
+        text,
         ...aiResponse
       } = await createTranscript(
         {
@@ -130,50 +131,21 @@ if (process.env.GCS_BUCKET_NAME) {
         { id: 'user-id', appId: 'app-id' }
       );
 
+      // Expect some keywords are identified.
+      // The whole text are not always 100% identical, but these keywords should be always included.
+      expect(text).toMatch(/^排/);
+      expect(text).toMatch(/德國醫學博士艾倫斯特發現/);
+      expect(text).toMatch(/汗也具有調節體溫的重要作用/);
       expect(aiResponse).toMatchInlineSnapshot(`
-        Object {
-          "appId": "app-id",
-          "docId": "foo",
-          "status": "SUCCESS",
-          "text": "排
-        汗
-        汗和排尿的差別
-        想要健康長壽就要想辦法一天一次大量排汗
-        德國醫學博士艾倫斯特發現:所有運動選手中
-        唯獨馬拉松選手沒有罹患癌症病例。
-        艾倫斯特博士採集了每天跑步 30 公里以上的
-        馬拉松選手的汗水,分析其汗水的成份結果
-        發現汗水中含有 鎘 鉛銅鎳等之重金屬物質。
-        證明出汗是排泄體內疲勞物質及對人體有害的
-        重金屬毒素的重要途徑
-        雖然排泄體內不需要物質的基本功能,有排便
-        排尿與出汗。而尿也會排出重金屬,但是排出
-        功能卻遠不及汗。
-        汗與尿中的重金屬元素量
-        鉛(微克)鎘(微克)鈷(微克)
-        6.5
-        1.2
-        0.65
-        0.6
-        汗 84
-        尿 4.9
-        100 克 中〉
-        鎳(微克)銅(毫克)
-        32
-        0.11
-        3.1
-        0.01
-        汗也具有調節體溫的重要作用。 全身健康的
-        出汗,就能夠強化現代最欠缺的體溫調節功能
-        與自律神經。
-        藉著汗,氣化熱消耗熱量,能夠提升代謝力,
-        不但減少體脂肪,還有助於消除肥胖。
-        可以先從關掉冷氣做起
-        ",
-          "type": "TRANSCRIPT",
-          "userId": "user-id",
-        }
-      `);
+      Object {
+        "appId": "app-id",
+        "docId": "foo",
+        "status": "SUCCESS",
+        "type": "TRANSCRIPT",
+        "userId": "user-id",
+      }
+    `);
+
       // Cleanup
       await client.delete({
         index: 'airesponses',
diff --git a/src/graphql/models/Article.js b/src/graphql/models/Article.js
index 8164a7f7..e0b4d921 100644
--- a/src/graphql/models/Article.js
+++ b/src/graphql/models/Article.js
@@ -44,6 +44,7 @@ import Hyperlink from './Hyperlink';
 import ReplyRequest from './ReplyRequest';
 import ArticleTypeEnum from './ArticleTypeEnum';
 import Cooccurrence from './Cooccurrence';
+import Contributor from './Contributor';
 
 const ATTACHMENT_URL_DURATION_DAY = 1;
 
@@ -580,6 +581,28 @@ const Article = new GraphQLObjectType({
           },
         }),
     },
+    contributors: {
+      type: new GraphQLNonNull(
+        new GraphQLList(new GraphQLNonNull(Contributor))
+      ),
+      description: 'Transcript contributors of the article',
+      resolve: ({ contributors }) => contributors ?? [],
+    },
+    transcribedAt: {
+      type: GraphQLString,
+      description: 'Time when the article was last transcribed',
+      resolve: async ({ contributors }) => {
+        if (!contributors || contributors.length === 0) {
+          return null;
+        }
+        const maxUpdatedAt = new Date(
+          Math.max(
+            ...contributors.map(contributor => new Date(contributor.updatedAt))
+          )
+        );
+        return maxUpdatedAt.toISOString();
+      },
+    },
   }),
 });
 
diff --git a/src/graphql/models/Contributor.js b/src/graphql/models/Contributor.js
new file mode 100644
index 00000000..5bf4cb78
--- /dev/null
+++ b/src/graphql/models/Contributor.js
@@ -0,0 +1,16 @@
+import { GraphQLObjectType, GraphQLString, GraphQLNonNull } from 'graphql';
+import User, { userFieldResolver } from './User';
+
+export default new GraphQLObjectType({
+  name: 'Contributor',
+  fields: () => ({
+    user: {
+      type: User,
+      description: 'The user who contributed to this article.',
+      resolve: userFieldResolver,
+    },
+    userId: { type: GraphQLNonNull(GraphQLString) },
+    appId: { type: GraphQLNonNull(GraphQLString) },
+    updatedAt: { type: GraphQLString },
+  }),
+});
diff --git a/src/graphql/mutations/CreateArticle.js b/src/graphql/mutations/CreateArticle.js
index 0aace2d6..31ea74be 100644
--- a/src/graphql/mutations/CreateArticle.js
+++ b/src/graphql/mutations/CreateArticle.js
@@ -82,6 +82,7 @@ async function createNewArticle({ text, reference: originalReference, user }) {
         attachmentUrl: '',
         attachmentHash: '',
         status: getContentDefaultStatus(user),
+        contributors: [],
       },
     },
     refresh: 'true', // Make sure the data is indexed when we create ReplyRequest
diff --git a/src/graphql/mutations/CreateMediaArticle.js b/src/graphql/mutations/CreateMediaArticle.js
index f3454356..f6fb1da7 100644
--- a/src/graphql/mutations/CreateMediaArticle.js
+++ b/src/graphql/mutations/CreateMediaArticle.js
@@ -162,6 +162,7 @@ async function createNewMediaArticle({
       articleType,
       attachmentHash,
       status: getContentDefaultStatus(user),
+      contributors: [],
     },
   });
 
diff --git a/src/graphql/mutations/__tests__/CreateMediaArticle.js b/src/graphql/mutations/__tests__/CreateMediaArticle.js
index 2031ede9..7c4ffd94 100644
--- a/src/graphql/mutations/__tests__/CreateMediaArticle.js
+++ b/src/graphql/mutations/__tests__/CreateMediaArticle.js
@@ -84,6 +84,7 @@ describe('creation', () => {
         "articleReplies": Array [],
         "articleType": "IMAGE",
         "attachmentHash": "mock_image_hash",
+        "contributors": Array [],
         "createdAt": "2017-01-28T08:45:57.011Z",
         "hyperlinks": Array [],
         "lastRequestedAt": "2017-01-28T08:45:57.011Z",
diff --git a/src/graphql/mutations/__tests__/__snapshots__/CreateArticle.js.snap b/src/graphql/mutations/__tests__/__snapshots__/CreateArticle.js.snap
index cbf68fa2..bbcad3c4 100644
--- a/src/graphql/mutations/__tests__/__snapshots__/CreateArticle.js.snap
+++ b/src/graphql/mutations/__tests__/__snapshots__/CreateArticle.js.snap
@@ -28,6 +28,7 @@ Object {
   "articleType": "TEXT",
   "attachmentHash": "",
   "attachmentUrl": "",
+  "contributors": Array [],
   "createdAt": "2017-01-28T08:45:57.011Z",
   "hyperlinks": Array [
     Object {
diff --git a/src/graphql/queries/ListArticles.js b/src/graphql/queries/ListArticles.js
index a05cad39..6ce629c5 100644
--- a/src/graphql/queries/ListArticles.js
+++ b/src/graphql/queries/ListArticles.js
@@ -16,6 +16,7 @@ import {
   intRangeInput,
   timeRangeInput,
   moreLikeThisInput,
+  userAndExistInput,
   getRangeFieldParamFromArithmeticExpression,
   createCommonListFilter,
   attachCommonListFilter,
@@ -136,22 +137,12 @@ export default {
         articleRepliesFrom: {
           description:
             'Show only articles with(out) article replies created by specified user',
-          type: new GraphQLInputObjectType({
-            name: 'UserAndExistInput',
-            fields: {
-              userId: {
-                type: new GraphQLNonNull(GraphQLString),
-              },
-              exists: {
-                type: GraphQLBoolean,
-                defaultValue: true,
-                description: `
-                  When true (or not specified), return only entries with the specified user's involvement.
-                  When false, return only entries that the specified user did not involve.
-                `,
-              },
-            },
-          }),
+          type: userAndExistInput,
+        },
+        transcribedBy: {
+          description:
+            'Show only articles with(out) article transcript contributed by specified user',
+          type: userAndExistInput,
         },
         hasArticleReplyWithMorePositiveFeedback: {
           type: GraphQLBoolean,
@@ -548,6 +539,22 @@ export default {
       });
     }
 
+    if (filter.transcribedBy) {
+      (filter.transcribedBy.exists === false
+        ? mustNotQueries
+        : filterQueries
+      ).push({
+        nested: {
+          path: 'contributors',
+          query: {
+            term: {
+              'contributors.userId': filter.transcribedBy.userId,
+            },
+          },
+        },
+      });
+    }
+
     if (filter.replyTypes) {
       filterQueries.push({
         nested: {
diff --git a/src/graphql/queries/__fixtures__/ListArticles.js b/src/graphql/queries/__fixtures__/ListArticles.js
index 2cc002ea..f4ff8713 100644
--- a/src/graphql/queries/__fixtures__/ListArticles.js
+++ b/src/graphql/queries/__fixtures__/ListArticles.js
@@ -46,6 +46,28 @@ export default {
         negativeFeedbackCount: 0,
       },
     ],
+    contributors: [
+      {
+        userId: 'user1',
+        appId: 'WEBSITE',
+        updatedAt: '2020-02-05T14:41:19.044Z',
+      },
+      {
+        userId: 'user2',
+        appId: 'WEBSITE',
+        updatedAt: '2020-02-09T14:41:19.044Z',
+      },
+      {
+        userId: 'user3',
+        appId: 'WEBSITE',
+        updatedAt: '2020-02-08T14:41:19.044Z',
+      },
+      {
+        userId: 'user4',
+        appId: 'WEBSITE',
+        updatedAt: '2020-02-07T14:41:19.044Z',
+      },
+    ],
     attachmentUrl: '',
     attachmentHash: '',
     articleType: 'TEXT',
@@ -105,6 +127,13 @@ export default {
         negativeFeedbackCount: 0,
       },
     ],
+    contributors: [
+      {
+        userId: 'user1',
+        appId: 'WEBSITE',
+        updatedAt: '2020-02-04T15:11:04.472Z',
+      },
+    ],
     attachmentUrl: '',
     attachmentHash: '',
     articleType: 'TEXT',
diff --git a/src/graphql/queries/__tests__/ListArticles.js b/src/graphql/queries/__tests__/ListArticles.js
index d7aa4a4e..44e10e4c 100644
--- a/src/graphql/queries/__tests__/ListArticles.js
+++ b/src/graphql/queries/__tests__/ListArticles.js
@@ -885,6 +885,50 @@ describe('ListArticles', () => {
     ).toMatchSnapshot('do not have articleReply from user1');
   });
 
+  it('filters via transcribedBy', async () => {
+    expect(
+      await gql`
+        {
+          ListArticles(filter: { transcribedBy: { userId: "user1" } }) {
+            edges {
+              node {
+                id
+                contributors {
+                  user {
+                    id
+                  }
+                }
+                transcribedAt
+              }
+            }
+          }
+        }
+      `({}, { appId: 'WEBSITE' })
+    ).toMatchSnapshot('transcribedBy user1');
+
+    expect(
+      await gql`
+        {
+          ListArticles(
+            filter: { transcribedBy: { userId: "user1", exists: false } }
+          ) {
+            edges {
+              node {
+                id
+                contributors {
+                  user {
+                    id
+                  }
+                }
+                transcribedAt
+              }
+            }
+          }
+        }
+      `({}, { appId: 'WEBSITE' })
+    ).toMatchSnapshot('is not transcribedBy user1');
+  });
+
   it('filters by reply types', async () => {
     expect(
       await gql`
diff --git a/src/graphql/queries/__tests__/__snapshots__/ListArticles.js.snap b/src/graphql/queries/__tests__/__snapshots__/ListArticles.js.snap
index 6b3b5e42..d4812ef7 100644
--- a/src/graphql/queries/__tests__/__snapshots__/ListArticles.js.snap
+++ b/src/graphql/queries/__tests__/__snapshots__/ListArticles.js.snap
@@ -709,6 +709,104 @@ Object {
 }
 `;
 
+exports[`ListArticles filters via transcribedBy: is not transcribedBy user1 1`] = `
+Object {
+  "data": Object {
+    "ListArticles": Object {
+      "edges": Array [
+        Object {
+          "node": Object {
+            "contributors": Array [],
+            "id": "listArticleTest7",
+            "transcribedAt": null,
+          },
+        },
+        Object {
+          "node": Object {
+            "contributors": Array [],
+            "id": "listArticleTest6",
+            "transcribedAt": null,
+          },
+        },
+        Object {
+          "node": Object {
+            "contributors": Array [],
+            "id": "listArticleTest5",
+            "transcribedAt": null,
+          },
+        },
+        Object {
+          "node": Object {
+            "contributors": Array [],
+            "id": "listArticleTest4",
+            "transcribedAt": null,
+          },
+        },
+        Object {
+          "node": Object {
+            "contributors": Array [],
+            "id": "listArticleTest3",
+            "transcribedAt": null,
+          },
+        },
+      ],
+    },
+  },
+}
+`;
+
+exports[`ListArticles filters via transcribedBy: transcribedBy user1 1`] = `
+Object {
+  "data": Object {
+    "ListArticles": Object {
+      "edges": Array [
+        Object {
+          "node": Object {
+            "contributors": Array [
+              Object {
+                "user": Object {
+                  "id": "user1",
+                },
+              },
+            ],
+            "id": "listArticleTest2",
+            "transcribedAt": "2020-02-04T15:11:04.472Z",
+          },
+        },
+        Object {
+          "node": Object {
+            "contributors": Array [
+              Object {
+                "user": Object {
+                  "id": "user1",
+                },
+              },
+              Object {
+                "user": Object {
+                  "id": "user2",
+                },
+              },
+              Object {
+                "user": Object {
+                  "id": "user3",
+                },
+              },
+              Object {
+                "user": Object {
+                  "id": "user4",
+                },
+              },
+            ],
+            "id": "listArticleTest1",
+            "transcribedAt": "2020-02-09T14:41:19.044Z",
+          },
+        },
+      ],
+    },
+  },
+}
+`;
+
 exports[`ListArticles filters via articleRepliesFrom: do not have articleReply from user1 1`] = `
 Object {
   "data": Object {
diff --git a/src/graphql/util.js b/src/graphql/util.js
index f2ef4141..322e4962 100644
--- a/src/graphql/util.js
+++ b/src/graphql/util.js
@@ -103,6 +103,23 @@ export const moreLikeThisInput = new GraphQLInputObjectType({
   },
 });
 
+export const userAndExistInput = new GraphQLInputObjectType({
+  name: 'UserAndExistInput',
+  fields: {
+    userId: {
+      type: new GraphQLNonNull(GraphQLString),
+    },
+    exists: {
+      type: GraphQLBoolean,
+      defaultValue: true,
+      description: `
+        When true (or not specified), return only entries with the specified user's involvement.
+        When false, return only entries that the specified user did not involve.
+      `,
+    },
+  },
+});
+
 export function createFilterType(typeName, args) {
   const filterType = new GraphQLInputObjectType({
     name: typeName,
diff --git a/test/rumors-db b/test/rumors-db
index 032b83e6..623c0c38 160000
--- a/test/rumors-db
+++ b/test/rumors-db
@@ -1 +1 @@
-Subproject commit 032b83e6a9b5758bc979dde99db81333501755f3
+Subproject commit 623c0c38741b900d69a09c89a7908d2abea47bc4