diff --git a/web/src/lib/api/repo.ts b/web/src/lib/api/repo.ts
--- a/web/src/lib/api/repo.ts
+++ b/web/src/lib/api/repo.ts
@@ -219,6 +219,9 @@
 	committerEmail: string;
 	committerWhen: string;
 	coAuthors: { name: string; email: string }[];
+	// filled in by the loader when the author's email resolves to an account
+	authorDid?: string;
+	authorHandle?: string;
 }
 
 // the diff endpoint's commit carries both signatures, unlike the log's
@@ -234,6 +237,7 @@
 		body,
 		authorName: commit.author?.Name ?? "",
 		authorEmail: commit.author?.Email ?? "",
+		authorDid: didFromSignature(commit.author?.Email ?? ""),
 		authorWhen: commit.author?.When ?? "",
 		committerName: commit.committer?.Name ?? "",
 		committerEmail: commit.committer?.Email ?? "",
diff --git a/web/src/lib/components/repo/CommitHeader.svelte b/web/src/lib/components/repo/CommitHeader.svelte
--- a/web/src/lib/components/repo/CommitHeader.svelte
+++ b/web/src/lib/components/repo/CommitHeader.svelte
@@ -3,6 +3,7 @@
 	import type { CommitDetail } from "$lib/api/repo";
 	import Avatar from "$lib/components/ui/Avatar.svelte";
 	import Pending from "$lib/components/ui/Pending.svelte";
+	import User from "$lib/components/ui/User.svelte";
 	import TimeAgo from "$lib/components/ui/TimeAgo.svelte";
 	import { formatDateTime } from "$lib/format";
 	import type { CommitStatuses } from "$lib/api/commitStatuses";
@@ -48,24 +49,39 @@
 		{/if}
 	</div>
 
-	{#snippet attribution(label: string, name: string, email: string)}
+	{#snippet attribution(
+		label: string,
+		name: string,
+		email: string,
+		did?: string,
+		handle?: string
+	)}
 		<span class="inline-flex flex-wrap items-center">
 			<span class="w-24 text-foreground-subtle select-none">{label}</span>
-			<!-- no email -> did mapping here, always the fallback form -->
-			<span class="flex items-center gap-1">
-				<Avatar size="large" />
-				{#if email}
-					<a href="mailto:{email}" class="no-underline hover:underline">{name}</a>
-				{:else}
-					<span>{name}</span>
-				{/if}
-			</span>
+			{#if handle}
+				<User {did} {handle} size="regular" link />
+			{:else}
+				<span class="flex items-center gap-1">
+					<Avatar size="large" />
+					{#if email}
+						<a href="mailto:{email}" class="no-underline hover:underline">{name}</a>
+					{:else}
+						<span>{name}</span>
+					{/if}
+				</span>
+			{/if}
 		</span>
 	{/snippet}
 
 	<div class="flex flex-col gap-2 pt-4 typography-paragraph-regular">
 		<div class="flex flex-col gap-1 font-mono text-foreground-muted">
-			{@render attribution("author", commit.authorName, commit.authorEmail)}
+			{@render attribution(
+				"author",
+				commit.authorName,
+				commit.authorEmail,
+				commit.authorDid,
+				commit.authorHandle
+			)}
 
 			{#each commit.coAuthors as coAuthor (coAuthor.email)}
 				{@render attribution("co-author", coAuthor.name, coAuthor.email)}
diff --git a/web/src/lib/components/repo/pulls/PullCommitRow.svelte b/web/src/lib/components/repo/pulls/PullCommitRow.svelte
--- a/web/src/lib/components/repo/pulls/PullCommitRow.svelte
+++ b/web/src/lib/components/repo/pulls/PullCommitRow.svelte
@@ -4,6 +4,7 @@
 	import type { CommitStatuses } from "$lib/api/commitStatuses";
 	import Link from "$lib/components/ui/Link.svelte";
 	import Tag from "$lib/components/ui/Tag.svelte";
+	import User from "$lib/components/ui/User.svelte";
 	import PipelineWorkflows from "../pipelines/PipelineWorkflows.svelte";
 	import type { CommitSummary } from "../types";
 
@@ -47,6 +48,17 @@
 			<div role="none" {onpointerenter} {onpointerleave} class="flex h-10 items-center">
 				<Link {onclick}>{commit.subject}</Link>
 			</div>
+			{#if commit.authorHandle}
+				<User did={commit.authorDid} handle={commit.authorHandle} size="small" link />
+			{:else if commit.authorName && commit.authorEmail && !commit.authorDid}
+				<a href="mailto:{commit.authorEmail}" class="shrink-0 text-inherit hover:underline">
+					<User handle={commit.authorName} size="small" link={false} />
+				</a>
+			{:else if commit.authorName}
+				<span class="typography-paragraph-small text-foreground-muted"
+					>{commit.authorName}</span
+				>
+			{/if}
 			{#if commit.body}
 				<button
 					type="button"
diff --git a/web/src/routes/[handle]/[repo]/commit/[ref]/+page.svelte b/web/src/routes/[handle]/[repo]/commit/[ref]/+page.svelte
--- a/web/src/routes/[handle]/[repo]/commit/[ref]/+page.svelte
+++ b/web/src/routes/[handle]/[repo]/commit/[ref]/+page.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
 	import { page } from "$app/state";
 	import { liveCommitStatuses } from "$lib/api/liveCommitStatuses.svelte";
-	import { toCommitDetail } from "$lib/api/repo";
+	import { toCommitDetail, type CommitDetail } from "$lib/api/repo";
 	import Bones from "$lib/components/ui/Bones.svelte";
 	import repoCommitviewFullCommit from "$lib/bones/repo-commitview--full-commit.bones.json";
 	import CommitView from "$lib/components/repo/CommitView.svelte";
@@ -29,7 +29,12 @@
 	{@const repo = await data.repo}
 	{@const commitDiff = await data.commitDiff}
 	{@const wire = commitDiff.commit ?? {}}
-	{@const commit = toCommitDetail(wire)}
+	{@const author = await data.author}
+	{@const commit = {
+		...toCommitDetail(wire),
+		authorDid: author?.did,
+		authorHandle: author?.handle
+	} satisfies CommitDetail}
 	<CommitView
 		ownerHandle={repo.ownerHandle}
 		repoName={repo.name}
diff --git a/web/src/routes/[handle]/[repo]/commit/[ref]/+page.ts b/web/src/routes/[handle]/[repo]/commit/[ref]/+page.ts
--- a/web/src/routes/[handle]/[repo]/commit/[ref]/+page.ts
+++ b/web/src/routes/[handle]/[repo]/commit/[ref]/+page.ts
@@ -4,6 +4,8 @@
 import { diffFor } from "$lib/api/diff";
 import type { DiffFile } from "$lib/api/diff";
 import { stream, toHttpError } from "$lib/api/load";
+import { toCommitDetail } from "$lib/api/repo";
+import { withAuthorHandles } from "$lib/api/repoIndex";
 import { diffRowKey, toFileDiffMetadata } from "$lib/components/repo/fileDiff";
 import { pierreDiffOptions } from "$lib/components/repo/pierre";
 import type { DiffStyle } from "$lib/components/repo/pierre";
@@ -51,12 +53,38 @@
 		return result.diff;
 	});
 
+	// resolve the author against the email-did mapping so the header can show
+	// the account; null when the commit is absent (the 404 guard already ran)
+	const authorPromise = diffPromise.then(async (diff) => {
+		const c = diff.commit;
+		if (!c) return null;
+		const detail = toCommitDetail(c);
+		const [author] = await withAuthorHandles(
+			[
+				{
+					hash: detail.hash,
+					shortHash: detail.shortHash,
+					subject: detail.subject,
+					body: detail.body,
+					authorName: detail.authorName,
+					authorEmail: detail.authorEmail,
+					authorDid: detail.authorDid,
+					when: detail.authorWhen
+				}
+			],
+			parent.publicConfig.bobbinUrl,
+			event.fetch
+		);
+		return { did: author.authorDid, handle: author.authorHandle };
+	});
+
 	const style = event.url.searchParams.get("diff") === "split" ? "split" : "unified";
 	const prerendered = diffPromise.then((diff) => prerenderDiffs(diff.diff ?? [], style));
 
 	return {
 		ref: event.params.ref,
 		commitDiff: stream(diffPromise),
+		author: stream(authorPromise),
 		prerendered: stream(prerendered)
 	};
 };
diff --git a/web/src/routes/[handle]/[repo]/pulls/[aturi]/[version]/+layout.ts b/web/src/routes/[handle]/[repo]/pulls/[aturi]/[version]/+layout.ts
--- a/web/src/routes/[handle]/[repo]/pulls/[aturi]/[version]/+layout.ts
+++ b/web/src/routes/[handle]/[repo]/pulls/[aturi]/[version]/+layout.ts
@@ -4,6 +4,7 @@
 import { listLog } from "$lib/api/gitmirror";
 import { stream } from "$lib/api/load";
 import { isRedirect, parseDiffRoute, parseInterdiffRoute } from "$lib/api/pullRoute";
+import { withAuthorHandles } from "$lib/api/repoIndex";
 import { countCommentsByCommit } from "$lib/components/comment/comments";
 import type { Did } from "@atcute/lexicons/syntax";
 import type { LayoutLoad } from "./$types";
@@ -30,7 +31,13 @@
 
 		// TODO: bobbin should hydrate the commit list with backlinked comment counts
 		const version = pull.versions[route.version];
-		const commits = version ? await listLog(ctx, sourceRepoDid as Did, version) : [];
+		const commits = version
+			? await withAuthorHandles(
+					await listLog(ctx, sourceRepoDid as Did, version),
+					parent.publicConfig.bobbinUrl,
+					event.fetch
+				)
+			: [];
 		const commentCounts = countCommentsByCommit(pullPage.comments);
 
 		return {