Sara Johanna de Beer
Sara Johanna de Beer( Paramaribo, 1749/ 1750 – died in Paramaribo after 1811) was a printer and editor of a number of newspapers and magazines in the Dutch colony of Surinam.
Johanna de Boer
Johanna de Boer( 6 January 1901 – 7 August 1984) was a Dutch fencer.
She competed in the women's individual foil at three Olympic Games.
Erica van Dijck
Henrica Petronella
Johanna Maria" Erica" van den Heuvel( van Dijck)( born 12 June 1966 in Helmond, North Brabant) is a retired female badminton player from the Netherlands.
She won the silver medal in mixed doubles at the 1988 European Badminton Championships, with partner Alex Meijer.
Mélanie de Jesus dos Santos
Mélanie Johanna de Jesus dos Santos( born 5 March 2000) is a French artistic gymnast and a three- time French national all- around champion( 2017- 2019).
Internationally, she is the 2019 European all- around champion and a two time European champion on floor exercise( 2018, 2019).
Ann Burton
Ann Burton( March 4, 1933, Amsterdam – November 29, 1989, Amsterdam) is the pseudonym of Johanna Rafalowicz( between 1938 and 1971: Johanna de Paauw), a Dutch jazz singer.
Nelly de Rooij
Petronella Johanna Nelly de Rooij (30 July 1883 – 10 June 1964) was a Dutch zoologist and herpetologist.
Johann Friedrich Hennert
Johann Friedrich Hennert (19 October 1733 – 30 March 1813) was German-born and lectured in mathematics and physics at the University of Utrecht.
He was a significant student of Leonhard Euler.
He was known for his inclination towards the British school of philosophy.
Nel Bos
Petronella Johanna Maria "Nel" Bos (born 23 November 1947) is a retired swimmer from the Netherlands.
She competed at the 1968 Summer Olympics in the 100 m freestyle, 100 m butterfly, 4×100 m freestyle relay and 4×100 m medley relay and finished in seventh place in the last event.
Petronella Johanna de Timmerman
Petronella Johanna de Timmerman (31 January 1723, Middelburg – 2 May 1786, Utrecht) was a Dutch poet and scientist.
Married in 1769 to Johann Friedrich Hennert, professor of mathematics, astronomy and philosophy.
During her second marriage, she conducted scientific experiments and studied physics with her spouse.
She was inducted as an honorary member of the academy ‘Kunstliefde Spaart Geen Vlijt’ in 1774.
She presented the academy with poems, translated French plays and planned to write a book about physics for women.
She suffered a stroke in 1776.
Her widower wrote a biography about her and published her poems.
Ali Rahuma
Ali Khalifa Rahuma( born May 16, 1982) is a Libyan football midfielder who's nationality is Libyan.
He currently plays for Al- Ittihad, and is a member of the Libya national football team.

Question: What nationality is Petronella Johanna De Timmerman's husband?
Answer: German