Faculty profile

Mark Walker

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Full ProfessorObstetrics and GynecologyUniversity of Ottawa

Mark Walker

Full Professor

Obstetrics and Gynecology

Faculty of Medicine

University of Ottawa

Ottawa, Ontario, Canada

Supervision signals

Professors usually supervise graduate students in their department's programs.
50 publications in the last five years, latest in 2026.
Senior (last) author on 13 recent papers, a sign of leading a research group.
Principal investigator on 8 research grants (8 CIHR), most recently in 2025.
Supervisor on 4 trainee awards (4 CIHR), most recently in 2025.

These signals come from public records, including CIHR, NSERC and SSHRC funding decisions. Ask the professor or the graduate program whether they are taking new students.

Academic metrics

156

Publications

863

Citations

163

Collaborators

Grants

Publications by year

Counts cover the publications linked to this profile. Citations and the h-index appear when the source records them.

Profiles and links

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Signals and details

Research

Read how they describe their research on their University of Ottawa profile.

Pregnancy Epidemiology Randomized Controlled Trial Immunization Respiratory Illness Respiratory Syncytial Virus (Rsv)Vaccine Clinical Trial

Latest papers

Maternal Immigrant Status and Mortality in Children With Congenital Heart Disease: A Population-Based Cohort Study.
Birth defects research · 2026 · senior author
Maternal vaccination with RSVpreF and risk of hypertensive disorders of pregnancy: a systematic review and meta-analysis.
Vaccine · 2026
The impact of a previous cesarean delivery on in vitro fertilization outcomes: a registry-based cohort study.
American journal of obstetrics and gynecology · 2026

All 156 publications

Latest funding

Assessing maternal and infant health outcomes following immunization for respiratory syncytial virus (RSV) disease
CIHR · 2025 · Principal investigator
$646,426
Advancing Prenatal Care: Machine Learning-Powered Detection of Congenital Heart Disease from Ultrasound Scans
CIHR · 2025 · Supervisor
$120,000
Respiratory Assessment among Pregnant Individuals for Detecting febrile infections in Ottawa, Ontario
CIHR · 2024 · Co-investigator
$100,000

All 40 grants and awards

From the 150 most recent of 156 publications.

Maternal Immigrant Status and Mortality in Children With Congenital Heart Disease: A Population-Based Cohort Study.

Miao Q, Dunn SI, Wen SW, Lougheed J, Griffiths R, Venegas CL, Velez MP, Walker M

Birth defects research2026Senior author

DOI: 10.1002/bdr2.70056 PMID: 42216616

Maternal vaccination with RSVpreF and risk of hypertensive disorders of pregnancy: a systematic review and meta-analysis.

Alami A, Lewis M, El-Chaâr D, Walker M, Wen SW, Krewski D

Vaccine2026

DOI: 10.1016/j.vaccine.2026.129070 PMID: 42667900

The impact of a previous cesarean delivery on in vitro fertilization outcomes: a registry-based cohort study.

Létourneau I, Walker M, Gale J

American journal of obstetrics and gynecology2026

DOI: 10.1016/j.ajog.2026.02.025 PMID: 41722753

Hemoglobin Concentration in Early Pregnancy and Severe Neonatal Morbidity and Mortality : A Population-Based Cohort Study.

Shams I, Tang GH, Wang X, Walker M, Baxter NN, Gomes T, Ray JG, Sholzberg M

Annals of internal medicine2026

DOI: 10.7326/annals-25-02586 PMID: 41628471

Associations between maternal race, socioeconomic status and shoulder dystocia: a population-based retrospective cohort study in Ontario Canada.

Miao Q, Guo Y, Maxwell C, Wen SW, St Hill A, Dingwall-Harvey A, Kuepfer T, Walker M

BMC pregnancy and childbirth2026Senior author

DOI: 10.1186/s12884-026-08924-6 PMID: 41864888

Organophosphate pesticide metabolite concentrations in a pregnancy cohort: daily variability, and predictors of exposure.

Caton L, MacPherson S, Arbuckle TE, Walker M, Fisher M

International journal of hygiene and environmental health2026

DOI: 10.1016/j.ijheh.2025.114716 PMID: 41317407

Late Pregnancy Antiseizure Medication Exposure and Offspring Neurodevelopmental Risk: A Multi-Child Cohort Study.

Sheehy O, Tchuente V, Eltonsy S, Hawken S, Kaul P, Walker M, Pugliese M, Dragan R, Savu A, Leal L, Morin L, Malhamé I, Pana R, Bérard A

Annals of neurology2026

DOI: 10.1002/ana.78084 PMID: 41311311

Ondansetron Use for Women With Hyperemesis Gravidarum and Risks of Spontaneous Abortion and Stillbirth: A Retrospective Cohort Study.

Yang J, Hong M, Liang F, Han Y, Xie R, Krewski D, Mattison D, Corsi DJ, Walker M, El-Chaâr D, McNair D, Xu J, Wen SW

Pharmacoepidemiology and drug safety2026

DOI: 10.1002/pds.70335 PMID: 41614660

Whole blood transfusion in the management of obstetric hemorrhage: A scoping review.

Lalonde J, Dion PM, Carpentier A, Chauret M, Eissa MS, Walker M, Shorr R, Mack J

Transfusion2026

DOI: 10.1111/trf.70013 PMID: 41391015

Per- and polyfluoroalkyl substances, vitamin D, and risk of preterm birth in a Canadian cohort.

Fisher M, Owen J, Marro L, Potter B, Weiler HA, England-Mason G, Borghese MM, Walker M, Dodds L, Helewa M, Arbuckle TE, Lanphear B, von Dadelszen P, Simpson A, Little J, Ashley-Martin J

Environmental research2026

DOI: 10.1016/j.envres.2026.124999 PMID: 42288278

Assessing maternal and infant health outcomes following immunization for respiratory syncytial virus (RSV) disease

Principal investigatorCIHR2025Project Grant

Principal investigators: El-Chaar, Darine; Buchan, Sarah; Fitzpatrick, Tiffany; Kwong, Jeffrey C; Morris, Shaun K; Walker, Mark C

Keywords: Epidemiology; Immunization; Pregnancy; Respiratory Illness; Respiratory Syncytial Virus (Rsv); Vaccine

$646,426

Advancing Prenatal Care: Machine Learning-Powered Detection of Congenital Heart Disease from Ultrasound Scans

SupervisorCIHR2025DRA : Canada Graduate Research Scholarship - Doctoral Program (CGRS D)

Principal investigators: Erman, Aylin

Keywords: Artificial Intelligence; Congenital Heart Disease; Machine Learning; Obstetrics

$120,000

Respiratory Assessment among Pregnant Individuals for Detecting febrile infections in Ottawa, Ontario

Co-investigatorCIHR2024Project Grant - PA: Pandemic Preparedness and Health Emergencies Research

Principal investigators: El-Chaar, Darine; McGuinty, Michaeline

Keywords: Influenza; Pregnancy; Respiratory Illness; Respiratory Syncytial Virus; Sars-Cov-2

$100,000

Piloting the EAGER trial: Expectant management versus induction At 38 weeks among individuals with GEstational diabetes mellitus - a Randomized controlled trial

Nominated PICIHR2023Project Grant

Principal investigators: Walker, Mark C; Asztalos, Elizabeth V; El-Chaar, Darine; Feig, Denice S; Fergusson, Dean A

Keywords: Clinical Trial; Expectant Management; Gestational Diabetes Mellitus; Induction Of Labour; Pilot Study; Randomized Controlled Trial

$569,926

Deep Learning Models for Prediction of Pre-eclampsia from Prenatal Ultrasound Placental Imaging

Principal investigatorCIHR2023Operating Grant: Data Analysis Using Existing CDN Databases and Cohorts

Principal investigators: Hawken, Steven; Bainbridge, Shannon A; Walker, Mark C

Keywords: Explainable Ai; Machine Learning; Neural Network; Placental Imaging; Pre-Eclampsia; Predictive Modeling; Prenatal Ultrasound

$74,796

Infant and child health outcomes following SARS-CoV-2 infection in pregnancy

Co-investigatorCIHR2023Project Gr. PA: Res. on Prevention/Response to Covid-19/Similar Future Pandemics

Principal investigators: El-Chaar, Darine; Brophy, Jason C; Hawken, Steven

Keywords: Child Health; Covid-19; Health Determinants; Healthcare Utilization; Infant Health; Infection; Neurodevelopment; Pregnancy; Prenatal Exposures; Sars-Cov-2

Cannabis use in pregnancy and associations with child developmental outcomes: an extension to the Ottawa and Kingston (OaK) Birth Cohort

Principal investigatorCIHR2022Op. Gr.: Cannabis Res. in Longitudinal studies - Human Dev., Child/youth Health

Principal investigators: Corsi, Daniel J; Walker, Mark C

Keywords: Cannabis; Child Development; Cohort Study; Health Behaviour; Perinatal; Pregnancy

$289,249

Infant and child health outcomes following SARS-CoV-2 infection in pregnancy

Co-investigatorCIHR2022Pr. Gr. - PA: Human Development Child and Youth Health - Mid Career Support

Principal investigators: El-Chaar, Darine; Brophy, Jason C; Hawken, Steven

Keywords: Covid-19; Health Determinants; Healthcare Utilization; Infant And Child; Neurodevelopment; Neurosensory Impairment; Pregnancy; Prenatal Exposures; Sars-Cov-2

$100,000

Substance use in pregnancy and associations with perinatal, neonatal, and childhood outcomes.

Co-investigatorCIHR2021Operating Grant: ECI grants in Maternal, Reproductive, Child & Youth Health

Principal investigators: Corsi, Daniel J

Keywords: Cannabis; Child Development; Cocaine; Database Study; Hallucinogens; Health Behaviour; Opioids; Perinatal; Pregnancy; Substance Use

$102,363

Pregnant and Lactating Individuals & Newborns COVID-19 Vaccination Study

Co-investigatorCIHR2021Operating Grant: Emerging COVID-19 Research Gaps and Priorities - Vaccines

Principal investigators: El-Chaar, Darine; Langlois, Marc-Andre; McGuinty, Michaeline

Keywords: Breastfeeding; Covid-19 Vaccines; Immunogenicity; Infant Outcomes; Maternal Newborn Health; Pregnancy

$500,000

From CIHR, NSERC and SSHRC funding decisions: CIHR since 2008, NSERC since 1991 and SSHRC since 1998, including their latest published competition results.

Profile data last refreshed on September 25, 2026 from the university directory, publication records and CIHR, NSERC and SSHRC funding.

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Mark Walker

Research

Latest papers

Latest funding

Maternal Immigrant Status and Mortality in Children With Congenital Heart Disease: A Population-Based Cohort Study.

Maternal vaccination with RSVpreF and risk of hypertensive disorders of pregnancy: a systematic review and meta-analysis.

The impact of a previous cesarean delivery on in vitro fertilization outcomes: a registry-based cohort study.

Hemoglobin Concentration in Early Pregnancy and Severe Neonatal Morbidity and Mortality : A Population-Based Cohort Study.

Associations between maternal race, socioeconomic status and shoulder dystocia: a population-based retrospective cohort study in Ontario Canada.

Organophosphate pesticide metabolite concentrations in a pregnancy cohort: daily variability, and predictors of exposure.

Late Pregnancy Antiseizure Medication Exposure and Offspring Neurodevelopmental Risk: A Multi-Child Cohort Study.

Ondansetron Use for Women With Hyperemesis Gravidarum and Risks of Spontaneous Abortion and Stillbirth: A Retrospective Cohort Study.

Whole blood transfusion in the management of obstetric hemorrhage: A scoping review.

Per- and polyfluoroalkyl substances, vitamin D, and risk of preterm birth in a Canadian cohort.

Frequent collaborators

Mandy Fisher

Steven Hawken

Julian Little

Laura Gaudet

Qun Miao

Bruce Lanphear

Kumanan Wilson

Yanfang Guo

Daniel Krewski

Sandra Dunn

Pranesh Chakraborty

Hong Chen

Gina Muckle

Darine El-Chaar

Scott Weichenthal

Scott Weichenthal

Eric Crighton

Graeme Smith

Warren Foster

Doug Coyle

Beth Potter

Graeme Smith

Deborah Weiss

Deshayne Fell

Linda Dodds

Brian Hutton

Liz Darling

Teresa To

Marc Rodger

Monica Taljaard

Sasha Bernatsky

Cindy-Lee Dennis

Diana Koszycki

Holly Etchegary

Joel Ray

Claire Kendall

Franco Momoli

Mona Loutfy

Astrid Guttmann

Nicole Letourneau