• Staff member at the chair of Prof Dr Kühne (Leibniz University Hannover)
• Scholarship holder of the VW Foundation for impact research on court decisions
• Research activity on international demands for reform of family law, Leibniz University Hannover, Chair of Prof Dr Meder (2010 - 2013)
• Lecturer at the ZEW of Leibniz University Hannover (2015 - 2019)
• Research project on English family and maintenance law (DFG) from 2009 - until 2013
• Doctorate in family law, child maintenance in England, in 2013
• Lecturer at the University of Münster, Institute for German and International Family Law (since 2023)

• Legislative Committee on Family Law in the DAV
• German Family Court Conference e.V.
• Working group on family law in the German Bar Association
• Medical Law Working Group of the German Bar Association
• Interest group of employers, self-employed and entrepreneurs e.V.
• Hanover Lawyers' and Notaries' Association
• Honorary membership Glücksmomente e.V.

Monographs, contributions

• Münchener Prozessformularbuch Familienrecht (ed. Gottwald), 7th edition (2026), Abstammungssachen (E.), in preparation for spring 2026
• Schwamb/Harders, FamFG, 23rd edition, new commentary on sections 4 and 5 (Parentage and adoption matters), planned for summer 2026
• Kischkel/Ostholdt (eds.), Handkommentar Familienrecht, new edition of: §§ 1589-1590, before §§ 1591-1599 BGB, §§ 1591-1599 BGB, §§ 1600-1600d BGB (in preparation for summer 2026)
• Rieck/Lettmaier, Foreign Family Law, new commentary on the country section Florida, 27. EL (2025)
• Rieck/Lettmaier, Foreign Family Law, new commentary on the country section California, 27. EL (2025)
• Recognising surrogacy carried out abroad, in Budzikiewicz/ Heiderhoff/ Klinkhammer/ Niethammer-Jürgens (eds.), Grenzen und Grenzverschiebungen im internationalen Familienrecht, 2024, p.25 ff.
• Kischkel/Ostholdt (eds.), Handkommentar Familienrecht, new edition of: §§ 1589-1590, before §§ 1591-1599 BGB, §§ 1591-1599 BGB, §§ 1600-1600d BGB (in preparation for summer 2025)
• Rieck/Lettmaier, Foreign Family Law, 23rd EL (2023), (country section England and Wales, completely revised)
• Modern parenthood - challenges for a modern parentage law, special edition Family Law Compact 2022
• The best interests of the child in law - Establishment, organisation and loss of parental custody, Göttingen 2018
• Geschichtliche Entwicklung des Unterhaltsrechts in England, in: Stephan Meder; Christoph Eric Mecke (eds.), Reformforderungen zum Familienrecht International, Vol. 1, Cologne, Weimar, Vienna 2015, p. 408 ff.
• Child maintenance in England - From the Poor Relief Act 1598 to the Child Support Act 1991, Cologne, Weimar, Vienna 2014

Essays

• Understanding modern legislation using the example of family law, NJW 2025, 879
• The future of parentage law, in FuR 2025, 61
• Parents and gender, in NZFam 2025, 57
• Three parents and one child, in FK 2024, 95
• Surrogacy in Germany? in FuR 2024, 408
• Reforms in family law - frustration or joy? Lawyers' Journal 2024, 140
• Key point papers of the BMJV: How national parentage law is to be adapted, FK 2024, 106
• Will there be a second female parent position? FK 2024, 87
• Becoming parents isn't difficult, is it? FK (Family Law Compact) 2024, 69
• The social-familial relationship as a means of preventing paternity?, in NZFam 2023, 817
• European parenthood - is that possible? in Ad Legendum 2023, 173
• Cross-border custody conflicts, in NJW-aktuell 28/2023, 12
• European parenthood - Is harmonisation possible? in NZFam 2023, 632
• The Embryo Protection Act of 1990 - mission accomplished?, in NZFam 2022, 870
• Modern parenthood, FK (Family Law Compact), Issue 1 /2022
• Voluntary parenthood, NZFam 2021, 853
• Your child, my child, our child, FK (Family Law Compact) 1/2021, 120
• Parentage law 2.0? NZFam 2020, 985
• The parentage of surrogate mothers' children, in NZFam 2020, 457
• Does The German Judiciary Truly Consider A Child's Best Interest? in: Lawyer Monthly, July 2019
• The Welfare of Children in Germany's Legal System, Lawyer Monthly Magazine, January 2018, p. 75
• Getting through the hardship of divorce, in: Lawyer Monthly Magazine, November 2017, p. 69
• New laws strengthen hospice and palliative care, in: pflegen: palliativ, issue 29/2016, p. 28 ff.
• Assisted suicide & Hospice and Palliative Care Act - What should change?, in: pflegen: palliativ, Issue 28/2015, p. 40 ff.
• Relatives and friends - who is allowed to know what?, in: pflegen: palliativ, Issue 2/2011, p. 23 ff.
• Trends in the judicial approach to protection and assistance, in: ZRP 1999, pp. 502 - 507 (with Prof. Dr H. A Hesse et al.)

Remarks

• Gender-neutral determination of first names after deselection of binary gender categories, comment on AG Darmstadt, decision of 3 April 2025 - 50 III 8/25, NZFam 2025, 720
• Inadmissibility of an application for a declaratory judgement in rectification proceedings pursuant to Section 48 PStG, comment on BGH 11.06.2025 - XII ZB 354/22, NZFam 2025, 980
• Contestation of maternity does not violate public policy, comment on AG Cologne 22 April 2025 - 378 III 32/25, jurisPR-FamR 19/2025 note 3
• Iura novit curia: Only appropriate reasons for decisions prevent a violation of the prohibition of arbitrariness, comment on BVerfG 16 April 2025 - 1 BvR 76/24, jurisPR-FamR 16/2025 note 4
• Statutory entitlement to remuneration of hospitals for outpatient deliveries, comment on BSG of 20 February 2025 - B 1 KR 6/24 R, jurisPR-MedR 7/2025 note 1
• No entitlement to 2 parents, comment on BVerfG of 10 April 2025 - 1 BvR 842/24, jurisPR-FamR 17/2025 note 1
• No adoption of an adult by a married adopter despite a social-familial relationship, comment on BVerfG of 10 April 2025 - 1 BvR 842/24, NZFam 2025, 747

Lectures, seminars, conferences, symposia

• Current developments in parentage and adoption law, Seminar Deutsche Anwaltsakademie (DAA), Düsseldorf, 19 March 2026
• Joint parental custody as a new standard in Japanese family law? Symposium to advise the Family Legislation Committee of the Japan Federation of Bar Associations (JFBA), Hamburg, 27/28 October 2025
• News on the reform of family law, Cologne Bar Association, 29/08/2025

Media, press and TV

• Sperm donation from coma patient allowed? Illu of the woman, April 2024
• One click to your dream child, SZ 30/31/03/01/04/2024
• CHILD DESIRE WITHOUT A PARTNER - "Better attach a child to a guy": Why solo mothers have a hard time in Germany, BuzzFeed.news v. 09.03.2024
• Social-familial relationship vs. genetic paternity, newstime Pro7/ Sat1 v. 26.10.2023
• WDR Morgenecho, Surrogacy in Ukraine, on 20 October 2023 (ARD Audiothek)
• British divorce law - 5 Years Separation Law (Boris Becker), BILD Zeitung 07.09.2023
• Surrogacy, BILD am Sonntag from 05.02.2023
• Deportation threatens imprisonment, the case of Boris Becker, RTL News v. 15.12.2022
• Surrogacy in Ukraine, Der Spiegel v. 16.09.2022
• Risk - pregnancy, Süddeutsche Zeitung Magazin v. 12.08.2022
• Fertility law, Podcast Andreas Berwing (honest leadership) June 2022
• Born in war - a wish child from Kiev, arte v. 31.05.2022
• Making dreams come true, Anwaltsblatt v. 02.05.2022
• Desire to have children without a partner, Stern TV v. 27.04.2022
• Surrogacy in Ukraine, NZZ v. 20.04.2022
• Violence blocks the system, HAZ v. 13.04.2022
• Babies in the bunker: Surrogate mothers in Ukraine, Weltspiegel (SWR) v. 09.04.2022 (ARD Audiothek)
• Why the war also endangers babies of German parents, Domradio v. 07.04.2022
• Ukrainian surrogate mothers between the fronts, Deutsche Welle (DW) v. 28.03.2022
• Surrogacy in Ukraine, BR of 31.07.2021
• Who pays after the separation? Welt am Sonntag from 27.09.2020
• Corona chaos with surrogacy in Ukraine, DW v. 25.05.2020
• Child abuse, protection mandate of the youth welfare office, NDR, Hallo Niedersachsen v. 11.5.2019
• Surrogacy is prohibited in Germany. How can couples still fulfil their most fervent wish for a child of their own? Bunte v. 05.07.2020