diff --git a/config/package-solution.json b/config/package-solution.json
index 61bc940..4c5f918 100644
--- a/config/package-solution.json
+++ b/config/package-solution.json
@@ -4,7 +4,7 @@
     "name": "organization-chart-webpart",
     "title": "organization-chart-webpart",
     "id": "b2f88ea8-f7da-4d0e-a945-6973bf1acd1e",
-    "version": "1.0.0.0",
+    "version": "1.0.1.0",
     "includeClientSideAssets": true,
     "skipFeatureDeployment": true
   },
diff --git a/package.json b/package.json
index 0259cf2..43f3cfc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "organization-chart-webpart",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "private": true,
   "main": "lib/index.js",
   "engines": { "node": ">=6.9.0 <9.0.0" },
diff --git a/src/webparts/organizationChart/OrganizationChartDataService.ts b/src/webparts/organizationChart/OrganizationChartDataService.ts
index 4bd3f68..874a212 100644
--- a/src/webparts/organizationChart/OrganizationChartDataService.ts
+++ b/src/webparts/organizationChart/OrganizationChartDataService.ts
@@ -41,7 +41,6 @@ export class OrganizationChartDataService {
     cacheMinutes: number
   ): Promise<IOrganizationChartData> {
     const account: string = normalizeAccount(accountName);
-    if (!account) { return Promise.reject(new Error('A user account is required.')); }
     const state: ITreeLoadState = {
       count: 0,
       maximum: normalizeMaxPeople(maxPeople),
@@ -49,11 +48,28 @@ export class OrganizationChartDataService {
       truncated: false,
       visited: {}
     };
-    return this.buildNode(account, 0, state, cacheMinutes).then((root: IOrganizationNode): IOrganizationChartData => ({
-      root: root,
-      peopleCount: state.count,
-      truncated: state.truncated
-    }));
+    const rootRequest: Promise<IUserProfile> = account
+      ? this.getProfile(account, cacheMinutes)
+      : this.getMyProfile(cacheMinutes);
+    return rootRequest
+      .then((profile: IUserProfile): Promise<IOrganizationNode> =>
+        this.buildProfileNode(profile, 0, state, cacheMinutes))
+      .then((root: IOrganizationNode): IOrganizationChartData => ({
+        root: root,
+        peopleCount: state.count,
+        truncated: state.truncated
+      }));
+  }
+
+  public getMyProfile(cacheMinutes: number): Promise<IUserProfile> {
+    const cacheKey: string = '__current_user__';
+    const cached: IProfileCacheEntry = OrganizationChartDataService.cache[cacheKey];
+    if (cached && cached.expires > new Date().getTime()) { return Promise.resolve(cached.profile); }
+    return this.requestProfile(
+      this.webUrl + '/_api/SP.UserProfiles.PeopleManager/GetMyProperties',
+      cacheKey,
+      cacheMinutes
+    );
   }
 
   public getProfile(accountName: string, cacheMinutes: number): Promise<IUserProfile> {
@@ -64,6 +80,10 @@ export class OrganizationChartDataService {
     const escaped: string = account.replace(/'/g, "''");
     const url: string = this.webUrl +
       "/_api/SP.UserProfiles.PeopleManager/GetPropertiesFor(accountName=@v)?@v='" + encodeURIComponent(escaped) + "'";
+    return this.requestProfile(url, key, cacheMinutes);
+  }
+
+  private requestProfile(url: string, cacheKey: string, cacheMinutes: number): Promise<IUserProfile> {
     return this.context.spHttpClient.get(url, SPHttpClient.configurations.v1, { headers: this.headers })
       .then((response: SPHttpClientResponse): Promise<any> => { // tslint:disable-line:no-any
         if (response.ok) { return response.json(); }
@@ -74,10 +94,14 @@ export class OrganizationChartDataService {
         const profile: IUserProfile = this.mapProfile(raw || {});
         const minutes: number = normalizeCacheMinutes(cacheMinutes);
         if (minutes > 0) {
-          OrganizationChartDataService.cache[key] = {
+          OrganizationChartDataService.cache[cacheKey] = {
             profile: profile,
             expires: new Date().getTime() + minutes * 60000
           };
+          if (profile.accountName) {
+            OrganizationChartDataService.cache[profile.accountName.toLowerCase()] =
+              OrganizationChartDataService.cache[cacheKey];
+          }
         }
         return profile;
       });
@@ -95,26 +119,39 @@ export class OrganizationChartDataService {
       if (state.count >= state.maximum) { state.truncated = true; }
       return Promise.resolve(undefined as IOrganizationNode);
     }
+    return this.getProfile(account, cacheMinutes).then((profile: IUserProfile): Promise<IOrganizationNode> =>
+      this.buildProfileNode(profile, depth, state, cacheMinutes));
+  }
+
+  private buildProfileNode(
+    profile: IUserProfile,
+    depth: number,
+    state: ITreeLoadState,
+    cacheMinutes: number
+  ): Promise<IOrganizationNode> {
+    const key: string = normalizeAccount(profile.accountName).toLowerCase();
+    if (!key || state.visited[key] || state.count >= state.maximum) {
+      if (state.count >= state.maximum) { state.truncated = true; }
+      return Promise.resolve(undefined as IOrganizationNode);
+    }
     state.visited[key] = true;
     state.count++;
-    return this.getProfile(account, cacheMinutes).then((profile: IUserProfile): Promise<IOrganizationNode> => {
-      const node: IOrganizationNode = { profile: profile, children: [] };
-      if (depth >= state.maximumDepth) {
-        if (profile.directReports.length) { state.truncated = true; }
-        return Promise.resolve(node);
-      }
-      const accounts: string[] = uniqueAccounts(profile.directReports, profile.accountName, state.maximum);
-      const requests: Array<Promise<IOrganizationNode>> = accounts.map(
-        (childAccount: string): Promise<IOrganizationNode> =>
-          this.buildNode(childAccount, depth + 1, state, cacheMinutes)
-            .catch((): IOrganizationNode => undefined as IOrganizationNode)
-      );
-      return Promise.all(requests).then((children: IOrganizationNode[]): IOrganizationNode => {
-        node.children = children.filter((child: IOrganizationNode): boolean => !!child)
-          .sort((left: IOrganizationNode, right: IOrganizationNode): number =>
-            left.profile.displayName.localeCompare(right.profile.displayName));
-        return node;
-      });
+    const node: IOrganizationNode = { profile: profile, children: [] };
+    if (depth >= state.maximumDepth) {
+      if (profile.directReports.length) { state.truncated = true; }
+      return Promise.resolve(node);
+    }
+    const accounts: string[] = uniqueAccounts(profile.directReports, profile.accountName, state.maximum);
+    const requests: Array<Promise<IOrganizationNode>> = accounts.map(
+      (childAccount: string): Promise<IOrganizationNode> =>
+        this.buildNode(childAccount, depth + 1, state, cacheMinutes)
+          .catch((): IOrganizationNode => undefined as IOrganizationNode)
+    );
+    return Promise.all(requests).then((children: IOrganizationNode[]): IOrganizationNode => {
+      node.children = children.filter((child: IOrganizationNode): boolean => !!child)
+        .sort((left: IOrganizationNode, right: IOrganizationNode): number =>
+          left.profile.displayName.localeCompare(right.profile.displayName));
+      return node;
     });
   }
 
diff --git a/src/webparts/organizationChart/OrganizationChartWebPart.ts b/src/webparts/organizationChart/OrganizationChartWebPart.ts
index 990563d..f617f04 100644
--- a/src/webparts/organizationChart/OrganizationChartWebPart.ts
+++ b/src/webparts/organizationChart/OrganizationChartWebPart.ts
@@ -37,9 +37,8 @@ export default class OrganizationChartWebPart extends BaseClientSideWebPart<IOrg
   private disposed: boolean = false;
 
   public render(): void {
-    const account: string = normalizeAccount(this.properties.startUser || this.context.pageContext.user.loginName);
+    const account: string = normalizeAccount(this.properties.startUser);
     const version: number = ++this.requestVersion;
-    if (!account) { this.renderStatus(strings.ConfigureMessage, false); return; }
     this.renderStatus(strings.LoadingMessage, false);
     this.service.getOrganization(
       account,
diff --git a/tests/validate-project.js b/tests/validate-project.js
index 7ec845d..c5ce4a3 100644
--- a/tests/validate-project.js
+++ b/tests/validate-project.js
@@ -25,6 +25,8 @@ assert(packageSolution.solution.includeClientSideAssets === true && packageSolut
 assert(!!config.bundles['organization-chart-webpart'], 'Bundle name is inconsistent.');
 assert(manifest.componentType === 'WebPart' && manifest.alias === 'OrganizationChartWebPart', 'Manifest is invalid.');
 assert(service.indexOf('/_api/SP.UserProfiles.PeopleManager/GetPropertiesFor') >= 0, 'User Profile REST access is missing.');
+assert(service.indexOf('/_api/SP.UserProfiles.PeopleManager/GetMyProperties') >= 0,
+  'Reliable current-user profile access is missing.');
 assert(service.indexOf('profile.directReports') >= 0 && service.indexOf('this.buildNode(childAccount, depth + 1') >= 0,
   'Recursive downward organization loading is missing.');
 assert(webPart.indexOf("PropertyPaneTextField('startUser'") >= 0, 'Starting-person configuration is missing.');