In 1886, he was elected assistant professor, and in 1898 professor of histology and comparative anatomy, at the same university, receiving the Prussian Order of the Red Eagle of the fourth class in the latter year.
Gustav married a second time (m. 13 September 1891); his second wife, Bertha Lipstein, gave birth to another son, Wolfgang (b.
Several technical inventions, as well as new methods in the field of microscopy and embryology, made Born's name prominent in his lifetime.
Among these was a method for reproducing and plastically enlarging small anatomical and embryological objects, which was described in Zeitschrift für Wissenschaftliche Mikroscopie, vol.
v. Gustav Jacob Born was a great-grandfather of Australian singer and actress Olivia Newton-John.