Huh, yup: John Marshall served jointly as Secretary of State and Chief Justice, for a few months at the end of the Adams administration. source: the sidebar he

Huh, yup: John Marshall served jointly as Secretary of State and Chief Justice, for a few months at the end of the Adams administration. source: the sidebar here https://en.wikipedia.org/wiki/John_Marshall https://en.wikipedia.org/wiki/John_Marshall