Lennie is an ICU consultant in the UMC Utrecht, with a background in infectious diseases and epidemiology. She co-leads (with Olaf Cremer) the "epidemiology of sepsis and inflammation" research group. Her research focuses on clinical trials in critically ill patients, especially those with sepsis and severe infections, to improve trial methodology/design, delivery, and analysis. Lennie is the European PI and immediate past global chair of REMAP-CAP, and a co-applicant and work package leader on EU-funded projects like RECOVER and ECRAID-Base, leads the ZonMw funded IMPRINT consortium and is co-applicant on several international collaborative grants. She is a member of the Steering Committee for the Surviving Sepsis Campaign and the ISAB of Sepsis Canada.

KEY TEACHING ACTIVITIES

Faculty ESICM Sustainability Masterclass (2024-present), Research Masterclass (2022-present), and Sepsis and Severe Infections Masterclass (2017-present)

Organizer Dutch ICU Fellows Education (GIC) on Infectious Diseases in ICU 2013-present

CONFERENCES and SEMINARS

Invited (inter-)national speaker for NVIC, CCR, ESICM, CCCF, ISICEM, ESCMID, ERS, Sepsis Update, ANZICS/ACCCN ASM (Keynote), International Sepsis Forum, and others

SERVICE

UMCU internal DSMB 2024-present

Co-vice chair for ESICM (since 2023) and Steering Committee member (since 2025) Surviving Sepsis Campaign

EMPRESS DSMB 2023-present

Ecraid Coordinating Committee 2022-present

Member International Advisory Board of Sepsis Canada 2021-present

ESICM Executive Committee 2022-2024

Chair ESICM Education and Training Committee 2022-2024

Chair International Trial Steering Committee REMAP-CAP 2021-2023

Member “Pandemic Preparedness Plan” committee for Dutch National Academy of Sciences (KNAW) 2021-2022

Taskforce Acute Infectious Threats for Dutch National ICU Society (NVIC) 2018-present (chair 2019-2021)