Huh, yup: John Marshall served jointly as Secretary of State and Chief Justice, for a few months at the end of the Adams administration.<p>source: the sidebar here <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;John_Marshall" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;John_Marshall</a>