Born in Aunay-sous-Auneau, Eure-et-Loir, Isambert studied law and, in 1818 (under the Second Restoration of the Bourbons), an attorney at the Cassation Court.
As a member of the Chamber of Deputies, he worked for legislative and administrative reforms in the colonies, and was noted for his attacks on the Roman Catholic Church.

He protested against the Ordinances of the year 1830 in the name of the bar, and thus sided with the Revolution and the July Monarchy.
He went among the first to the town hall, where he was named by the provisional government director of the Bulletin de Lois.
Named counsel at the cassation court on August 27, he edited the Constitutional Charter, and joined the Chamber of Deputies in October of that year.
Born in Aunay-sous-Auneau, Eure-et-Loir, Isambert studied law and, in 1818 (under the Second Restoration of the Bourbons), an attorney at the Cassation Court. As a member of the Chamber of Deputies, he worked for legislative and administrative reforms in the colonies, and was noted for his attacks on the Roman Catholic Church.
He protested against the Ordinances of the year 1830 in the name of the bar, and thus sided with the Revolution and the July Monarchy. He went among the first to the town hall, where he was named by the provisional government director of the Bulletin de Lois. Named counsel at the cassation court on August 27, he edited the Constitutional Charter, and joined the Chamber of Deputies in October of that year.
François-André Isambert