All three would eventually become members of the Hamburger Künstlerverein [de], and Jacob served on the Board of Directors.
They were also all members of the Hamburger Turnerschaft von 1816 [de], a gymnastics society.
[1] By the mid-1820s, he and Martin were teaching art history and drawing at the Gelehrtenschule des Johanneums.
According to documentary records, he was in Dresden in 1829, and travelled to Amsterdam in 1837, where he studied the works of Rembrandt and Bartholomeus van der Helst.
[1] The year 1844 found him in Rome, seeking new inspiration, which was apparently not forthcoming.