Gaussen was descended on both sides from eminent Huguenot mercantile families which came to England from Geneva not long after being exiled from France and prospered. He inherited a fortune from his father and, while maintaining a foothold in the business world, bought in 1786 a Hertfordshire estate to which he afterwards added.
Gaussen was recommended by Villiers to Pitt as being as ‘zealous’ as himself ‘in the cordial support of your wishes in Parliament’. He had signed the London merchants’ loyal declaration in 1795 and his brother-in-law, Jacob Bosanquet, was the principal spokesman of City interests collaborating with Pitt’s administration. He was apparently a silent Member, but in December 1797 he sent Pitt his ideas on taxation.
