diff --git a/aio/content/marketing/README.md b/aio/content/marketing/README.md
index 67b249e55c..6733da3b84 100644
--- a/aio/content/marketing/README.md
+++ b/aio/content/marketing/README.md
@@ -1,26 +1,28 @@
 # Contributors page
 
-We have an official accounting of who is on the Angular Team, who are "trusted collaborators" (see team.angular.io/collaborators), and so on.
+We have an official accounting of who is on the Angular Team, who are "trusted collaborators" (see https://team.angular.io/collaborators), and so on.
 
-The contributors.json should be maintained to keep our "org chart" in a single consistent place.
+The `contributors.json` should be maintained to keep our "org chart" in a single consistent place.
 
 ## GDE listings
 
 There are two pages:
 
-https://developers.google.com/experts/all/technology/angular
+- https://developers.google.com/experts/all/technology/angular
 (Googlers: source at http://google3/googledata/devsite/content/en/experts/all/technology/angular.html)
 which is maintained by Dawid Ostrowski based on a spreadsheet
-https://docs.google.com/spreadsheets/d/1_Ls2Kle7NxPBIG8f3OEVZ4gJZ8OCTtBxGYwMPb1TUVE/edit#gid=0
+https://docs.google.com/spreadsheets/d/1_Ls2Kle7NxPBIG8f3OEVZ4gJZ8OCTtBxGYwMPb1TUVE/edit#gid=0.
+  <!-- gkalpak: That URL doesn't seem to work any more. New URL: https://developers.google.com/programs/experts/directory/ (?) -->
 
-and ours: https://angular.io/about?group=GDE which is derived from contributors.json.
+- Ours: https://angular.io/about?group=GDE which is derived from `contributors.json`.
 
 Alex Eagle is investigating how to reconcile these two lists.
 
-## Checking the keys
+## About the data
 
-Keys in contributors.json should be GitHub handles. (Most currently are, but not all)
-This will allow us to use GitHub as the default source for things like Name, Avatar, etc.
+- Keys in `contributors.json` should be GitHub handles. (Most currently are, but not all.)
+  This will allow us to use GitHub as the default source for things like name, avatar, etc.
+- Pictures are stored in `aio/content/images/bios/<picture-filename>`.
 
 ## Processing the data
 
@@ -32,3 +34,5 @@ do echo -e "\n$handle\n---------\n"; curl --silent -H "Authorization: token ${TO
  | jq ".message,.name,.company,.blog,.bio" --raw-output
 done
 ```
+
+Relevant scripts are stored in `aio/scripts/contributors/`.
diff --git a/aio/package.json b/aio/package.json
index 10dc48c9ca..fa496762d6 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -44,7 +44,7 @@
     "check-env": "yarn ~~check-env",
     "postcheck-env": "yarn aio-check-local",
     "payload-size": "scripts/payload.sh",
-    "predocs": "yarn generate-stackblitz && yarn generate-zips",
+    "predocs": "node scripts/contributors/check-pictures && yarn generate-stackblitz && yarn generate-zips",
     "docs": "yarn docs-only",
     "docs-only": "dgeni ./tools/transforms/angular.io-package",
     "docs-watch": "node tools/transforms/authors-package/watchr.js",
diff --git a/aio/scripts/contributors/check-pictures.js b/aio/scripts/contributors/check-pictures.js
new file mode 100644
index 0000000000..a3a656c469
--- /dev/null
+++ b/aio/scripts/contributors/check-pictures.js
@@ -0,0 +1,28 @@
+#!/usr/bin/env node
+
+// Imports
+const {existsSync, readFileSync} = require('fs');
+const {join, resolve} = require('path');
+
+// Constants
+const CONTENT_DIR = resolve(__dirname, '../../content');
+const IMAGES_DIR = join(CONTENT_DIR, 'images/bios');
+const CONTRIBUTORS_PATH = join(CONTENT_DIR, 'marketing/contributors.json');
+
+// Run
+_main();
+
+// Functions - Definitions
+function _main() {
+  const contributors = JSON.parse(readFileSync(CONTRIBUTORS_PATH, 'utf8'));
+  const expectedImages = Object.keys(contributors)
+      .filter(key => !!contributors[key].picture)
+      .map(key => join(IMAGES_DIR, contributors[key].picture));
+  const missingImages = expectedImages.filter(path => !existsSync(path));
+
+  if (missingImages.length > 0) {
+    throw new Error(
+        'The following pictures are referenced in \'contributors.json\' but do not exist:' +
+        missingImages.map(path => `\n  - ${path}`).join(''));
+  }
+}