[1] He was the brother of Agatha van Hoorn, who married his friend, the Haarlem mayor Cornelis Guldewagen.
[2] Andries became magistrate in 1627, and captain of the schutterij in 1633, when he was painted by Frans Hals in his group portrait The Officers of the St Adrian Militia Company in 1633.
In his portrait of Andries as captain, Frans Hals seems to have him talking with his brother-in-law Lieutenant Buttinga who is seated in the foreground looking up at him.
Andries turns towards the viewer as if he is interrupted, and it is this informal pose which set Frans Hals apart as a painter and made him popular as a group portraitist in Haarlem.
Buttinga had previously been painted three years earlier as sergeant on the far right in Hendrik Pot's The Officers of the St Adrian Militia Company in 1630.