Farewell to Erasmus University Rotterdam (but not to UCL and Monash) on May 12, 2023, with a Valedictory Lecture 

At 4pm CET on May 12, 2023, I delivered a valedictory lecture at EUR, titled:

Balancing Attachment: Replication, Translation, Academic Freedom

The digital version of the lecture can be downloaded here.

Van IJzendoorn 230505 proofs Balancing Attachment Valedictory Lecture EUR _3

Before the lecture a symposium took place from 1 pm-3.30 pm in the Erasmus Building, room C2-2. Speakers contributing to the symposium were prof. dr. John Ioannidis (Stanford),  dr. Ryan Muetzel (Erasmus MC), and dr. Rixt van der Veen (UvA). 

Latest news on the Valedictory Lecture:

Article on Academic Freedom in Trouw, a Dutch national newspaper:

Trouw opinie 230510 Academische vrijheid

Very brief Dutch summary of the valedictory lecture for the press:

Zaterdag 16 april 2022 werd in Trouw onze opiniebijdrage gepubliceerd over Interlandelijke adoptie, doorgaan of stoppen?

Daarin gebruikte bronnen:

Van IJzendoorn, M.H. & Bakermans-Kranenburg, M.J. (2022, in press). Intercountry adoption is a child protection measure. Some comments on “Investigating historical abuses” by Balk, Frerks and De Graaf (2022). Journal of Applied History.

Van IJzendoorn, M. H., & Bakermans-Kranenburg, M. J. (2022). Tearing down or fixing up institutional care for abandoned children? Comment on Rygaard (2020). American Psychologist, 77(1), 135–137.

Van IJzendoorn, M.H., Bakermans-Kranenburg, M.J., Duschinsky, R., Goldman, P.S., Fox, N.A., Gunnar, M.R., Johnson, D.E., Nelson, C.A., Reijman, S., Skinner, G.C.M., Zeanah, C.H., & Sonuga-Barke, E.J.S. (2020). Institutionalisation and deinstitutionalisation of children I: A systematic and integrative review of evidence regarding effects on development. The Lancet Psychiatry; 7, 703-720; published online June 23.

Goldman, P.S., Bakermans-Kranenburg, M.J., Bradford, B., Christopoulos, A.,  Lim Ah Ken, P., Agastya, N.L.P.M., Cuthbert, C., Duchinsky, R., Fox, N.A.,  Grigoras, S., Gunnar, M.R., Ibrahim, R.W., Johnson, D.E., Kusumaningrum, S., Mwangangi, F.M., Nelson, C.A., Ott, E.M., Reijman, S., Van IJzendoorn, M.H., Zeanah, C.H., Zhang, Y. & Sonuga-Barke, E.J.S. (2020).  Institutionalisation and deinstitutionalisation of children II: policy and practice recommendations for global, national, and local actors. The Lancet Child and Adolescent Health , 4, 606-633; published online June 23;

Goldman, P.S., van IJzendoorn, M.H., & Sonuga-Barke, E.J.S. on behalf of the Lancet Institutional Care Reform Commission Group (2020). The implications of COVID-19 for the care of children living in residential institutions. The Lancet Child & Adolescent Health, (Correspondence) April 21, 2020 S2352-4642(20)30130-9 

Van IJzendoorn, M.H. & Bakermans-Kranenburg, M.J. (2021). Replication crisis lost in translation? On translational caution and premature applications of attachment theory. Attachment & Human Development. 23, 422-437. 

Dobrova-Krol, N. A., & van IJzendoorn, M. H. (2017). Institutional care in Ukraine: Historical underpinnings and developmental consequences. In A. V. Rus, S. R. Parris, & E. Stativa (Eds.), Child maltreatment in residential care: History, research, and current practice (pp. 219–240). Springer International Publishing.

van Ginkel, J. R., Juffer, F., Bakermans-Kranenburg, M. J. & van IJzendoorn, M. H. (2016). Do internationally adopted children in the Netherlands use more medication than their non-adopted peers? European Journal of Pediatrics 175(5), 715-25.

Juffer, F., & Van IJzendoorn, M.H. (2007). Adoptees do not lack self-esteem: A meta-analysis of studies on self-esteem of transracial, international and domestic adoptees. Psychological Bulletin, 133, 1067-1083. doi:10.1037/0033-2909.133.6.1067


In 2020 appointment as visiting professor at the Research Department of Clinical, Educational and Health Psychology, Division on Psychology and Language Sciences, Faculty of Brain Sciences, UCL, University of London, London, UK.

UCL academics named in annual global list of influential researchers _ UCL News – UCL – University College London s

Some work published recently:

Min, J.L., Hemani, G., Hannon, E. et al. Genomic and phenotypic insights from an atlas of genetic effects on DNA methylation. Nature Genetics 53, 1311–1321 (2021).

A meta-analysis of more than 3 decades work on our parenting intervention program has been accepted for publication, titled ‘Improving parenting, child attachment and externalizing behaviors: Meta-analysis of the first 25 randomized controlled trials on the effects of Video-feedback Intervention to Promote positive Parenting and Sensitive Discipline’, to appear in Development & Psychopathology. 

Van IJzendoorn, M.H. & Bakermans-Kranenburg, M.J. (2021). Replication crisis lost in translation? On translational caution and premature applications of attachment theory. Attachment & Human Development. 23, 422-437.

O’Farrelly, C, Watt, H., Babalis, D., Bakermans-Kranenburg, M.J., Barker, B., Byford, S., Ganguli, P., Grimas, E., Iles, J., Mattock, H., McGinley, J., Phillips, C., Ryan, R., Scott, S., Smith, J., Stein, A., Stevens, E., Van IJzendoorn, M.H., Warwick, J.,  Ramchandani, P.G (2021). A brief home-based parenting intervention (VIPP-SD) to prevent enduring behaviour problems in young children: A pragmatic randomised clinical trial. JAMA Pediatrics. Published online March 15, 2021. doi:10.1001/jamapediatrics.2020.6834

Warrier, V., Siu Fung Kwong, A., Luo, M., Dalvie, S., Croft, J., Sallis, H. M., Baldwin,J., Munafo, M.R., Nievergelt, C. M., Grant, A. J., Burgess, S., Moore, T. M., Barzilay, R., McIntosh, A., Van IJzendoorn, M.H.,   Cecil , C.M. (2021). Gene-environment correlations and causal effects of childhood maltreatment on physical and mental health: a genetically informed approach. Lancet Psychiatry,  8 (5), 373-386, DOI:

At three different universities four wonderful PhD students successfully defended their PhD theses in 2021

Rosa Mulder (2021, January 19). DNA methylation and stress in child development: A population-based approach Erasmus Universiteit Rotterdam (Advisors: prof.dr. M.H. van IJzendoorn, prof. dr. H. Tiemeier & prof. dr. M.J. Bakermans-Kranenburg)
Lylian Ayiro (2021, April 30). Moderating role of child personality factors on the relation between parenting style, child maltreatment and behavior problems in Bungoma county, Kenya. Maseno University (Advisors: Dr Catherine Mbagaya, prof.dr. Marinus van IJzendoorn, Prof. dr.Lucas Othuon)
Barry Coughlan, (2021). Clinical Perspectives on the Assessment and Diagnosis of Social and Neurodevelopmental Conditions in Children. University of Cambridge . (Advisors: dr Robbie Duschinsky, dr. Matt Woolgar, prof.dr. Marinus van IJzendoorn)
Helen Beckwith (2021, May 7). Understandings of attachment theory for clinical practice. University of Cambridge . (Advisors: dr Robbie Duschinsky, dr. Matt Woolgar, prof.dr. Marinus van IJzendoorn, prof Mark Freeston)

Papers published online:

The Conversation published a summary of the main points of the paper on causal effects of child maltreatment on later poorer mental health for a wider readership.

On June 24, 2020 The Lancet Psychiatry and The Lancet Child and Adolescent Health published our papers on institutionalisation and de-institutionalisation, with some commentaries; the papers are open access:

A webinar presentation about institutional child rearing was uploaded on youtube video:

On April 21  The Lancet Child & Adolescent Health published our letter on The implications of COVID-19 for the care of children living in residential institutions.

Some other recently published work:

Hamaker, E.L.,  Mulder, J.D., &  van IJzendoorn, M.H. (2020). Description, prediction and causation: Methodological challenges of studying child and adolescent developmentDevelopmental Cognitive Neuroscience, 46, 100867, ISSN 1878-9293,

article link:

In The Lancet Psychiatry a letter on the use of attachment theory in perinatal, infant and child psychiatry: From attachment to mental health and back

galbally et al. 2020 From attachment to mental health and back. The Lancet Psychiatr

Problematic cost-utility analysis of interventions for behavior problems in children and adolescents

New Directions in Child and Adolescent Development

van IJzendoorn & Bakermans-Kranenburg 2020 NDCAD Problematic cost–utility analysis ofinterventions for behavior problems in children and adolescents

The Conversation published March 31, 2020 our brief piece for young parents on bonding (or the absence thereof) with their newborn


Published in 2020

Oxford Handbook of Children and the Law (Editor: Jim Dwyer)

with our chapter on ‘Legislation in Search of “Good-Enough” Care Arrangements for the Child: A Quest for Continuity of Care’ (Marinus H. van IJzendoorn, Marian J. Bakermans-Kranenburg, Robbie Duschinsky, and Guy C. M. Skinner)

Two papers on child maltreatment

Van IJzendoorn, M.H., Bakermans-Kranenburg, M.J., Duschinsky, R., Goldman, P.S., Fox, N.A., Gunnar, M.R., Johnson, D.E., Nelson, C.A., Reijman, S., Skinner, G.C.M., Zeanah, C.H., & Sonuga-Barke, E.J.S. (2020). The impact of institutionalisation and deinstitutionalisation on children’s development -A systematic and integrative review of evidence from across the globe. Lancet Psychiatry, in press.

Van IJzendoorn, M. H., Bakermans‐Kranenburg, M. J., Coughlan, B., & Reijman, S. (2020). Umbrella synthesis of meta‐analyses on child maltreatment antecedents and interventions: differential susceptibility perspective on risk and resilience. Journal of Child Psychology and Psychiatry.

PhD dissertation of David van IJzendoorn defended on January 16, 2020, at Leiden University Medical Center

At three different universities three wonderful PhD students successfully defended their PhD theses in 2019

van Hoof, Marie-Jose (November 21, 2019). Unresolved-Disorganized Attachment, Psychopathology, and the Adolescent Brain. Leiden University (Advisors: prof.dr. M.H. van IJzendoorn, prof. dr. R.R.J.M. Vermeiren & dr. M.M.E. Hendricx-Riem)
Neumann, Alexander (June 21, 2019). General Psychopathology in Children. Epidemiological studies of Biological Mechanisms. Erasmus Universiteit Rotterdam (Advisors: prof.dr. M.H. van IJzendoorn, prof. dr. M.J. Bakermans-Kranenburg & prof. dr. H. Tiemeier)
Verhees, Martine (September 4, 2019). Exploring dynamics and mechanisms of attachment variability in middle childhood. KU Leuven. (Advisors: prof dr Guy Bosmans, prof.dr. M.H. van IJzendoorn & prof. dr. Eva Ceulemans).

Lifetime Achievement Award 2019
The Society for Emotion and Attachment Studies (SEAS) awarded Marinus van IJzendoorn the Lifetime Achievement Award 2019 at the International Attachment Conference (IAC) in Vancouver, Canada, July 18-20, 2019.

Remarkable email from John Ioannidis on the new impact ranking

(August 20, 2019) 

Warm congratulations by Ioannidis in an email

Dear friends and colleagues

We have just published in PLoS Biology a paper that presents detailed, standardized citation data annotated for scientific field for multiple impact indicators and their composite across science

I want to congratulate you for being in the top 0.01% of scientists based on your impact.

The presented metrics capture not only total citations and h-index, but also co-authorship adjusted impact, and information on impact in papers according to different author positions (single, first, last author). As you know, citation metrics are widely used and misused, and we hope that this effort will allow for a more transparent, more comparable, and less error-prone approach to these metrics. We present very detailed data on all the top-100,000 scientists across science and additional field-adjusted information that can be used to map all 7 million scientists who have published at least 5 papers in their career. across all 22 major fields and all 176 sub-fields. Extensive information is also provided on self-citations and metrics are estimated both with and without self-citations.

The raw data are available for download and unrestricted use at Mendeley Data. I hope you enjoy these databases!

With best wishes for continued success,


John P.A. Ioannidis, MD, DSc
C.F. Rehnborg Professor in Disease Prevention
Professor of Medicine, of Health Research and Policy, and (by courtesy) of Biomedical Data Science, and of Statistics
Co-Director, Meta-Research Innovation Center at Stanford (METRICS)
Director, PhD Program in Epidemiology and Clinical Research
Stanford University

Conflict of Interest Disclosure Form should not include questions about personal beliefs, activities or life-style

As one of the Associate Editors of Child Development Marinus wrote a letter to the Publication Committee of the SRCD to point out that the non-financial conflict of interests disclosure is an encroachment of some fundamental human rights including freedom of speech.

See the statement here:

Argument against scientific journals’ Non-financial Conflict of Interest

A paragraph from the statement:

Newton believed in astrology, Einstein was a pacifist during war-time, Heidegger was a Nazi, Sartre a Maoist, Darwin has been accused of being an atheist and an anti-feminist, Watson (discoverer of the double helix) a sexist like Trivers, and many other scientists who did great work: whatever we feel about such beliefs, as scientists (authors, reviewers, editors) we should try to evaluate their work as part of World 3 in the sense of Karl Popper, without ties to the person who conducted a study and wrote a paper: not the author but the text and the data reported in the text are the only important object of scrutiny. Otherwise there is a risk of a new kind of McCarthyism of which Linus Pauling like many other scientists did suffer in the fifties, or closer to modern times: a risk of Erdogan-type of persecution experienced by our scientific colleagues in Turkey, dismissed without due process from their tenured positions because of their political ideas.

The good news is that the Publication Committee of the SRCD decided last month to delete this part of the Conflict of Interest Form! The Committee members are gratefully acknowledged for discussing these issues seriously and to decide accordingly.

Bad news about migrant children at the USA-Mexican border

A Troubling Prognosis for Migrant Children in Detention_ – The New York Times June 18 2018

The long-lasting health effects of separating children from their parents at the U.S. border Los Angeles Times June 20, 2018

    • •Van IJzendoorn, M.H. & Bakermans-Kranenburg, M.J. (2014, May 21). ‘Tackling child behaviour problems effectively requires better understanding of differences between an ‘orchid’ child and a ‘dandelion’ child’. Retrieved from

Child and Family Blog

    • • Securely attached to science. Psychologist, (2013), 26(9), 639.


    • • Wall Street Journal, interview with Jonathan Rockoff on differential susceptibility, September 17, 2013, on page D2 in the U.S. edition


    • • Neue Zuercher Zeitung, December 23, 2010, on differential susceptibility


    • • Frankfurter Allgemeine Zeitung, January 24 2010, on adoption from Haiti


    • • The Atlantic Monthly, December issue 2009, pp 60-68, interview with David Dobbs on Orchid Children


    • • Mare, Leiden University Weekly, December 13, 2007, listed with 3 papers in the ranking of the 10 most frequently cited Leiden University papers since


    • 1981 in the social and behavioral sciences (ranks 1, 2, and 9).


    • • HP/De Tijd November 30, 2007, listed as one of the 20 most influential scientists/ thinkers in the Netherlands


    • • Minneapolis Star Tribune (May 24, 2005) interview with L. Tanner + J. Hopfensperger: Foreign adoptees adjust well in new homelands


    • • Miami Herald (May 25, 2005) interview with L. Tanner: Study: Kids adopted from abroad adapt well (also in: Chicago Tribune, Boston Globe, and Los


    • Angeles Times (May 24, 2005)


    • • The New York Times, The New York Post, USA Today and The Washington Post (May 25, 2005)


    • • Forbes (May 25, 2005) interview with R. Preidt: International Adoptees At Lower Risk of Behavior Problems


    • • BBC World Radio interview May 25, 2005, on International vs national adoptions


    • Wall Street Journal, April 12 2005, interview with Sue Shellenbarger: Child care boost academics, hurt behavior.