L.I.M. Lenferink PhD (Lonneke)

Assistant Professor

About Me

I work as assistant professor at University of Twente, senior researcher at Fund Victim Support, and guest researcher at University of Groningen, Utrecht University (NL), Aarhus University (DK) and University of New South Wales (AUS). My research is focused on the definition, assessment, prediction, and treatment of disturbed grief in bereaved adults and children.  

In projects among people who experienced losses because of a long-term disappearance, homicide, MH17 plane disaster, traffic accident, COVID-19, and Russian war in Ukraine I examine risk factors and treatment of distress. I have authored more than 80 peer-reviewed journal articles. According to a bibliometric study from 2023 on the most productive/influential authors on the topic of prolonged grief disorder (https://doi.org/10.1080/07481187.2023.2196734) I am the third most productive academic in the world.

As main applicant/principal investigator, I received funding (> 870.000 euros) for ten research projects, including a NWO Veni-grant in 2022. As co-applicant, I received funding (>250.000 euros) for four research projects. Funding agencies that financially supported my work are Fund Victim Support, Dutch Ministry of Justice and Safety, NWO, SASS, Stichting Catharine van Tussenbroek, and Utrecht and Twente University Fund.

Additional roles:
1. Editor for special issue on grief in Frontiers in Psychiatry (https://www.frontiersin.org/research-topics/23195/consequences-and-aftercare-of-a-traumatic-loss-of-a-loved-one) (2021-2023)
2. Ad-hoc reviewer for several academic journals (see for overview: https://www.webofscience.com/wos/author/record/155722)
3. Former board member of the Dutch Society for Psychotrauma (see www.ntvp.nl). This is a society for therapists and researchers working with psychotrauma. It consists of 600+ members and ~14.000 LinkedIn followers. (2019-2023)
4. Chair Special Interest Group Traumatic Grief of the Dutch Society for Psychotrauma (2023-current)
5. Finance/Research officer Bereavement Network Europe (community that connects European professionals working with bereaved people) (2020-current)
6. Teacher in research practice at PPO (a post-master education for clinical psychologists) (2019-current)
7. Editorial board of Impact Magazine (https://oorlog.arq.org/nl/impact-magazine-0) (2021-current)
8. Review committee member Dutch Veterans Institute (Nederlands Veteranen Instituut) (2022)

Co-promotor/Principal investigator/Daily supervisor
PhD Candidate Iris van Dijk (2020-2024)
PhD Candidate Lyanne Reitsma (2020-2024)
PhD Candidate Lieke Nijborg (2022-2025)

PhD Candidate Deniz Ergun (2023-2027)


PhD Committee member
PhD Sander Vos (2021)




Medicine & Life Sciences
Latent Class Analysis
Post-Traumatic Stress Disorders
Social Sciences


Lenferink, L. I. M., Nickerson, A., Kashyap, S., de Keijser, J., & Boelen, P. A. (2024). Associations of dimensions of anger with distress following traumatic bereavement. Psychological Trauma: Theory, Research, Practice, and Policy, 16(2), 176-183. https://doi.org/10.1037/tra0001275
Pociunaite, J., van Dijk, I., Reitsma, L., Leonard Nordström, E. E., Boelen, P. A. , & Lenferink, L. (2023). Latent trajectories of DSM-5-TR-based Prolonged Grief Disorder: findings from a data pooling project MARBLES. European Journal of psychotraumatology, 14(2), Article 2281183. https://doi.org/10.1080/20008066.2023.2281183
Lenferink, L. (2023). The disappearance of a loved one: Consequences and care. Paper presented at Missing Children in Europe: for a better cooperation between countries and 116000 hotlines 2023, Paris, France.
Lenferink, L. I. M., van Dijk, I., Eisma, M. C., Eklund, R., Boelen, P. A., & Sveen, J. (2023). Psychometric evaluation of the Swedish Traumatic Grief Inventory Self-Report Plus (TGI-SR+) in bereaved parents. Clinical Psychology and Psychotherapy. https://doi.org/10.1002/cpp.2922
Lenferink, L., de Keijser, J., & Boelen, P. A. (2023). Vermissing. In Handboek Traumatische Rouw (2 ed., pp. 137-149). Uitgeverij Boom.
de Keijser, J. , Lenferink, L., Reitsma, L., & Smid, G. E. (2023). Rampen, aanslagen en pandemieën. In J. de Keijser, P. Boelen, & G. Smid (Eds.), Handboek Traumatische Rouw (2 ed., pp. 123-136). Uitgeverij Boom.
Prakash, K., Kassam-Adams, N. , Lenferink, L., & Greene, T. (2023). Data sharing and re-use in the traumatic stress field: An international survey of trauma researchers. European Journal of psychotraumatology, 14(2), Article 2254118. https://doi.org/10.1080/20008066.2023.2254118
Lenferink, L. (2023). Is it acceptable and feasible to measure prolonged grief disorder symptoms in daily life using experience sampling methodology?. Paper presented at 7th European Society for Research on Internet Interventions, ESRII 2023, Amsterdam, Netherlands.
Lioupi, C., Anastassiou-Hadjicharalambous, X., Acquarini, E., Ajdukovic, D., Ardino, V., Böttche, M., Dragan, M., Figueiredo-Braga, M., Gelezelyte, O., Grajewski, P., Javakhishvili, J. D., Kazlauskas, E. , Lenferink, L., Lueger-Schuster, B., Tsiskarishvili, L., Mooren, T., Sales, L., Ajdukovic, M., Zrnic Novakovic, I., ... Lotzin, A. (2023). Predictors of traumatic experiences among individuals experiencing pandemic-related stressors: a cross-sectional study in Europe during the COVID-19 crisis. Current Psychology. Advance online publication. https://doi.org/10.1007/s12144-023-05036-8
Lenferink, L. (2023). Is it acceptable and feasible to measure prolonged grief disorder symptoms in daily life using experience sampling methodology?. Paper presented at 17th biennial conference of the European Society for Traumatic Stress Studies, ESTSS 2023, Belfast, Ireland.
Lenferink, L. (2023). Latent trajectories of DSM-5-TR based Prolonged Grief Disorder: Findings from a data pooling project MARBLES. Paper presented at 17th biennial conference of the European Society for Traumatic Stress Studies, ESTSS 2023, Belfast, Ireland.
Lenferink, L. (2023). Grief is a family affair: examining longitudinal associations between prolonged grief in parents and their adult children using four-wave cross-lagged panel models. Paper presented at 17th biennial conference of the European Society for Traumatic Stress Studies, ESTSS 2023, Belfast, Ireland.
Lenferink, L. I. M., Eisma, M. C., Buiter, M. Y., de Keijser, J., & Boelen, P. A. (2023). Online cognitive behavioral therapy for prolonged grief after traumatic loss: a randomized waitlist-controlled trial. Cognitive behaviour therapy, 52(5), 508-522. https://doi.org/10.1080/16506073.2023.2225744
Comtesse, H., Killikelly, C., Hengst, S. M. C. , Lenferink, L. I. M., de la Rie, S. M., Boelen, P. A., & Smid, G. E. (2023). The Ambiguous Loss Inventory Plus (ALI+): Introduction of a measure of psychological reactions to the disappearance of a loved one. International journal of environmental research and public health, 20(6), Article 5117. https://doi.org/10.3390/ijerph20065117
Sadeh, Y., Denejkina, A., Karyotaki, E. , Lenferink, L. I. M., & Kassam-Adams, N. (2023). Opportunities for improving data sharing and FAIR data practices to advance global mental health. Global Mental Health, 10, Article e14. https://doi.org/10.1017/gmh.2023.7

UT Research Information System

Google Scholar Link

Affiliated Study Programmes



Courses Academic Year  2023/2024

Courses in the current academic year are added at the moment they are finalised in the Osiris system. Therefore it is possible that the list is not yet complete for the whole academic year.

Courses Academic Year  2022/2023

Current Projects

Finished Projects

In the press

Media outlet highlights
Original title [English title]

Date (day/month/year)

  1. Interview Dutch national newspaper Algemeen Dagblad
    Zoektocht naar vermiste Samuël gestaakt: ‘We moeten nu accepteren dat hij niet gevonden wordt’ [The search for Samuël discontinued: ‘We now need to accept that he will not be found’]
  2. Interview professional Dutch magazine Vakblad Uitvaart
    Grotere kans op rouwstoornis door corona [Increased risk of a grief disorder due to corona
  3. Interview Dutch national newspaper Algemeen Dagblad
    Hoe rouw je in tijden van corona? [How to grieve in times of COVID?]

  4. Blog Nederlandstalige Vereniging voor Psychotrauma
    Yalom: “Get in therapy; go through your own issues!”

  5. Interview Dutch national radio Radio1
    Radio 1: Online rouwen tijdens pandemie [Grieving online during pandemic]

  6. Dutch national t.v. Nieuwsuur
    Hoe is het om door corona nooit echt afscheid te kunnen nemen van je geliefde [What is it like to never really say goodbye to your loved one because of corona?]

  7. Online Dutch article published by Fund Victim Support
    Afscheid en rouw in tijden van corona
    [Farewell and grief in COVID-19 times]
  8. Live-interview Dutch national radio Radio1
    Impact op achterblijvers van vermiste is enorm [impact on those left behind after a disappearance is huge]
  9. Interview Dutch national newspaper Algemeen Dagblad
    Hierdoor maakt de vermissing van Dirk Dalebout meer los dan andere zaken
    [This is why the disappearance of Dirk Dalebout results in relatively more reactions than other cases]
  10. Interview Dutch national newspaper Algemeen Dagblad
    Bijna 300 vermiste Nederlanders: het kan ook jou overkomen [Nearly 300 missing Dutch people: it could also happen to you

  11. Interview Dutch national newspaper Volkskrant Magazine
    "Ik zou zo graag willen horen uw kind is dood"
    [“I would like to hear your child is dead”]
  12. Interview Dutch professional magazine "de Psycholoog"
    Tussen hoop en vrees [In limbo]

  13. Interview Dutch national newspaper NRC Handelsblad
    "Hardnekkige rouw om een vermiste" [Disturbing grief after someone is missing]

  14. Online interview for Dutch national news NOS
    Mensen die hoop houden na de vermissing van een dierbare hebben de meeste klachten [People who maintain hope after the disappearance of loved one have the highest distress]

  15. Interview regional Dutch newspaper “de Stentor”
    Achterblijvers van vermisten in therapie
    [Relatives of missing people in treatment]
  16. Live regional Dutch television interview Omroep Brabant
    88 Brabanders langdurig vermist
    [88 people from the region Brabant are long-term missing]

Contact Details

Visiting Address

University of Twente
Drienerlolaan 5
7522 NB Enschede
The Netherlands

Navigate to location

Mailing Address

University of Twente
P.O. Box 217
7500 AE Enschede
The Netherlands