ROCCA co-directors
![A photographed portrait of Dr. Paul Nathan](https://lab.research.sickkids.ca/rocca/wp-content/uploads/sites/149/2024/02/MG_0071Nathan_Paul_25JAN2023.jpg)
Dr. Paul Nathan, MD, M.Sc.
Paul Nathan is head of the AfterCare program and the Solid Tumor Section at SickKids. He is a Professor at the University of Toronto and Senior Associate Scientist at SickKids.
Dr. Nathan studies the long-term outcomes experienced by survivors of childhood and AYA cancers and ways that the health-care system can best address their lifelong needs.
![A photographed portrait of Dr. Petros Pechlivanoglou](https://lab.research.sickkids.ca/rocca/wp-content/uploads/sites/149/2023/12/Pechlivanoglou_Petros_14DEC2023_MG_9870-scaled.jpeg)
Dr. Petros Pechlivanoglou, PhD
Petros Pechlivanoglou is a Senior Scientist at SickKids and an Associate Professor at the University of Toronto.
Dr. Pechlivanoglou uses decision analysis and statistical modeling to estimate long-term health and economic consequences of disease and treatment exposures in childhood.
![A photographed portrait of Dr. Sumit Gupta](https://lab.research.sickkids.ca/rocca/wp-content/uploads/sites/149/2024/02/MG_0810Sumit_Gupta_30JAN2024-scaled.jpg)
Dr. Sumit Gupta, MD, PhD
Sumit Gupta is head of the Leukemia/Lymphoma Section in the Division of Haematology/Oncology at SickKids and an Associate Professor at the University of Toronto. He currently holds the Garron Family Chair in Childhood Cancer Research.
Dr. Gupta’s research focuses on identifying vulnerable subpopulations of children and AYAs with cancer and on improving their outcomes.
Research staff
![Alex-M_Headshot-scaled-e1676691556501-300×300-1-e1680011682444 A photographed portrait of Alexandra Moskalewicz.](https://lab.research.sickkids.ca/rocca/wp-content/uploads/sites/149/2023/08/Alex-M_Headshot-scaled-e1676691556501-300x300-1-e1692631091791.png)
Alexandra Moskalewicz, M.Sc.
Alexandra Moskalewicz is a Research Analyst in the ROCCA program, supporting studies which examine the long-term health and economic impacts of childhood and AYA cancers. She holds a Master of Science in Health Services Research from the University of Toronto.
![A photographed portrait of Maria Locke.](https://lab.research.sickkids.ca/rocca/wp-content/uploads/sites/149/2023/08/Locke-Maria_27MAR2023_DSC3256-1-Large-e1692728139797.png)
Maria Locke, BA
Maria Locke is a Clinical Research Project Coordinator supporting research projects that fall under the ROCCA program. She holds an Honours Bachelor of Arts in Criminal Justice and Public Policy from the University of Guelph.