diff --git a/scripts/authors.ts b/scripts/authors.ts
new file mode 100644
index 00000000000..6b7bacfd77d
--- /dev/null
+++ b/scripts/authors.ts
@@ -0,0 +1,182 @@
+import fs = require('fs');
+import path = require('path');
+import child_process = require("child_process");
+
+type Author = {
+    displayNames: string[];
+    preferedName?: string;
+    emails: string[];
+};
+
+type AuthorMap = { [s: string]: Author };
+
+type Command = {
+    (...arg: string[]): void;
+    description?: string;
+};
+
+const mailMapPath = path.resolve("../.mailmap");
+const authorsPath = path.resolve("../AUTHORS.md");
+
+function getKnownAuthors(): Author[] {
+    const segmentRegExp = /\s?([^<]+)\s+<([^>]+)>/g;
+    const preferedNameRegeExp = /\s?#\s?([^#]+)$/;
+    const knownAuthors: Author[] = [];
+
+    if (!fs.existsSync(mailMapPath)) {
+        throw new Error(`Could not load known users form .mailmap file at: ${mailMapPath}`);
+    }
+
+    const mailMap = fs.readFileSync(mailMapPath).toString();
+
+    for (const line of mailMap.split("\r\n")) {
+        const author: Author = { displayNames: [], emails: [] };
+        let match: RegExpMatchArray | null;
+
+        while (match = segmentRegExp.exec(line)) {
+            author.displayNames.push(match[1]);
+            author.emails.push(match[2]);
+        }
+        if (match = preferedNameRegeExp.exec(line)) {
+            author.preferedName = match[1];
+        }
+        if (!author.emails) continue;
+        knownAuthors.push(author);
+        if (line.indexOf("#") > 0 && !author.preferedName) {
+            throw new Error("Could not match prefered name for: " + line);
+        }
+        // console.log("===> line: " + line);
+        // console.log(JSON.stringify(author, undefined, 2));
+    }
+    return knownAuthors;
+}
+
+function getAuthorName(author: Author) {
+    return author.preferedName || author.displayNames[0];
+}
+
+function getKnownAuthorMaps() {
+    const knownAuthors = getKnownAuthors();
+    const authorsByName: AuthorMap = {};
+    const authorsByEmail: AuthorMap = {};
+    knownAuthors.forEach(author => {
+        author.displayNames.forEach(n => authorsByName[n] = author);
+        author.emails.forEach(e => authorsByEmail[e.toLocaleLowerCase()] = author);
+    });
+    return {
+        knownAuthors,
+        authorsByName,
+        authorsByEmail
+    };
+}
+
+function deduplicate<T>(array: T[]): T[] {
+    let result: T[] = []
+    if (array) {
+        for (const item of array) {
+            if (result.indexOf(item) < 0) {
+                result.push(item);
+            }
+        }
+    }
+    return result;
+}
+
+function log(s: string) {
+    console.log(`   ${s}`);
+}
+
+function sortAuthors(a: string, b: string) {
+    if (a.charAt(0) === "@") a = a.substr(1);
+    if (b.charAt(0) === "@") b = b.substr(1);
+    if (a.toLocaleLowerCase() < b.toLocaleLowerCase()) {
+        return -1;
+    }
+    else {
+        return 1;
+    }
+}
+
+namespace Commands {
+    export const writeAuthors: Command = function () {
+        const output = deduplicate(getKnownAuthors().map(getAuthorName).filter(a => !!a)).sort(sortAuthors).join("\r\n* ");
+        fs.writeFileSync(authorsPath, "TypeScript is authored by:\r\n* " + output);
+    };
+    writeAuthors.description = "Write known authors to AUTHORS.md file.";
+
+    export const listKnownAuthors: Command = function () {
+        deduplicate(getKnownAuthors().map(getAuthorName)).filter(a => !!a).sort(sortAuthors).forEach(log);
+    };
+    listKnownAuthors.description = "List known authors as listed in .mailmap file.";
+
+    export const listAuthors: Command = function (spec = "") {
+        const cmd = "git shortlog -se " + spec;
+        console.log(cmd);
+        const outputRegExp = /\d+\s+([^<]+)<([^>]+)>/;
+        const tty = process.platform === 'win32' ? 'CON' : '/dev/tty';
+        const authors: { name: string, email: string, knownAuthor?: Author }[] = [];
+        child_process.exec(`${cmd} < ${tty}`, { cwd: path.resolve("../") }, function (error, stdout, stderr) {
+            if (error) {
+                console.log(stderr.toString());
+            }
+            else {
+                const output = stdout.toString();
+                const lines = output.split("\n");
+                lines.forEach(line => {
+                    if (line) {
+                        let match: RegExpExecArray | null;
+                        if (match = outputRegExp.exec(line)) {
+                            authors.push({ name: match[1], email: match[2] });
+                        }
+                        else {
+                            throw new Error("Could not parse output: " + line);
+                        }
+                    }
+                });
+
+                const maps = getKnownAuthorMaps();
+
+                const lookupAuthor = function ({name, email}: { name: string, email: string }) {
+                    return maps.authorsByEmail[email.toLocaleLowerCase()] || maps.authorsByName[name];
+                };
+
+                const knownAuthors = authors
+                    .map(lookupAuthor)
+                    .filter(a => !!a)
+                    .map(getAuthorName);
+                const unknownAuthors = authors
+                    .filter(a => !lookupAuthor(a))
+                    .map(a => `${a.name} <${a.email}>`);
+
+                if (knownAuthors.length) {
+                    console.log("\r\n");
+                    console.log("Found known authors: ");
+                    console.log("=====================");
+                    deduplicate(knownAuthors).sort(sortAuthors).forEach(log);
+                }
+
+                if (unknownAuthors.length) {
+                    console.log("\r\n");
+                    console.log("Found unknown authors: ");
+                    console.log("=====================");
+                    deduplicate(unknownAuthors).sort(sortAuthors).forEach(log);
+                }
+            }
+        });
+    };
+    listAuthors.description = "List known and unknown authors for a given spec";
+}
+
+var args = process.argv.slice(2);
+if (args.length < 1) {
+    console.log('Usage: node authors.js [command]');
+    console.log('List of commands: ');
+    Object.keys(Commands).forEach(k => console.log(`     ${k}: ${(Commands as any)[k]['description']}`));
+} else {
+    var cmd: Function = (Commands as any)[args[0]];
+    if (cmd === undefined) {
+        console.log('Unknown command ' + args[1]);
+    } else {
+        cmd.apply(undefined, args.slice(1));
+    }
+}