[3] When his father-in-law died, he was contracted by the local city magistrates to complete the sculpture of Christ for the Calvary group on the Falconplein (Falcon square) in Antwerp.
[3] Van Opstal was awarded the title 'sculpteur des batiments du roi' (Sculptor of the king's buildings) in 1651.
[5] He is particularly important for having brought a legal case in 1667 against the widow of a patron, Duchemin, intendant to Mademoiselle d'Orléans, for nonpayment of a commission dating from 1658.
[4] He was known for his sculptures at the Porte Saint-Antoine in Paris, made in 1670 in honour of Louis XIV's 10th marriage anniversary.
Gerard Van Opstal created three sculptures personifying France, Spain and Hymen, to be placed in niches.