He was Keeper of the Great Seal of Scotland from 1794 to 1806 and from 1807 to 1827.

The Great Seal of Scotland, number 1995 confirmed at Edinburgh 1 November 1648.

The Great Seal of Scotland, no. 345, confirmed at Edinburgh 24 July 1610.

There may be more entries in the Register of the Great Seal of Scotland.

He was Keeper of the Great Seal of Scotland from 1714-16.

The post, which now has no formal responsibilities or salary, is held by commission under the Great Seal of Scotland.

The Great Seal of Scotland, number 294 confirmed 2 August 1662.

For a short time from July 1806 he was keeper of the Great Seal of Scotland.

This is recorded in the Register of the Great Seal of Scotland.

Campbell was nominated Keeper of the Great Seal of Scotland in 1841, an office he held for the next five years.