Our Global Team

Columbia University Medical Center

Elena J. Ladas, PhD, RD

Elena Ladas

Sid and Helaine Lerner Professorship for Global Integrative Medicine, Assistant Professor of Nutrition (in Pediatrics and the Institute Of Human Nutrition), Columbia University Medical Center, Division of Pediatric Hematology/Oncology/Stem Cell Transplant

Dr. Ladas is the first appointee to the Sid and Helaine Lerner Professorship for Global Integrative Medicine and an internationally recognized clinical investigator. Her expertise is in the clinical application and evaluation of nutrition and integrative medicine.  She is a Co-Director of the Center for Comprehensive Wellness (CCW) and directly oversees the nutrition and integrative therapies program within CCW. Dr. Ladas is the principal investigator on a number of multi-institutional studies that evaluate the role of nutrition and integrative medicine as components of supportive care during and after treatment for childhood cancer. Specifically, her research is evaluating the influence of dietary intake on the development of nutrition-related morbidities (such as obesity) during treatment for cancer. She is also evaluating the role of acupuncture in reducing symptoms associated with treatment for cancer. Her NIH R01 is evaluating the role of probiotic therapy in children undergoing stem cell transplantation.  On a national level, she is a Co-Chair of the Nutrition Committee, Children’s Oncology Group (COG). Through this position, she works with a national team of physicians, nurses, and dieticians to set nutritional research priorities that may be conducted through COG. Internationally, she is the Co-Chair of the Nutrition Committee, International Society of Pediatric Oncology (SIOP), and Pediatric Oncology in Developing Countries (PODC). Through this collaboration, Dr. Ladas works with investigators in Central and South America, Asia, and Africa to enhance the delivery of nutritional care to children who are undergoing treatment for cancer and who live in a low- or middle-income country. Research Publications

Suvekshya Aryal, MPH

Suvekshya Aryal, MPH

Suvu Aryal is the Research Coordinator for IIPAN. She received her Master of Public Health in Epidemiology and an Advanced Certificate in Global Health from Columbia University Mailman School of Public Health. At Columbia, she was awarded the Mailman Scholar Scholarship and the Earth Institute Sustainable Development Research Grant. She has a research background in molecular biology and global public health. She has worked with global agencies like Helen Keller International, World Vision, and collaborated with UNICEF and Save the Children while conducting child mental health research and nutritional interventions in Nepal. She received her BSc in Biology from Salem College, North Carolina. She was born and raised in Nepal and completed her high school education in Kathmandu. She is fluent in Nepali and Hindi.


Karina Viani, RD

Karina Viani, RD

Dietician at ITACI Hospital, Sao Paulo, Brazil.

Karina graduated from the University of Sao Paulo and specialized in clinical nutrition in pediatrics. Currently, she works in the Hematology-Oncology department at the Institute of Treatment of Childhood Cancer, Institute of the Child, Clinics Hospital, School of Medicine, and University of Sao Paolo (ITACI), where she is also enrolled in the post-graduation program for her Master’s degree. She is an active member of the SIOP-PODC nutrition working group, working on several international collaborations.


Dr. Paul C Rogers

Dr. Paul C. Rogers

Clinical Professor, Division of Pediatric Oncology Hematology, British Columbia Children’s Hospital, University of British Columbia, Formerly Professor and Head of Pediatric Hematology/Oncology & Bone marrow transplantation, Vancouver, Canada.

Forty years in tertiary, university affiliated hospitals with clinical, teaching, research (clinical trials) and administrative responsibilities, as well as administrative leadership and strategic planning experience with university and hospitals. Dr. Rogers has worked as Principal Investigator with Children's Oncology Group (COG), Investigator  for National Cancer Institute USA,  and Medical Staff at the President Children’s & Women’s Hospital Vancouver. He has formerly served as C17 Executive (Canadian Pediatric Oncology Consortium), an Advisory Council for Canadian Partners against Cancer (CPAC), and as Co-chair Canadian National taskforce for Adolescent and Young Adult Cancer. Dr. Rogers also served as a secretary general, a board member and a local chair in Vancouver for the International Society of Pediatric Oncology (SIOP). In the past he has held responsibilities of Senior Consultant/Lecturer (Part-Time) at the Red Cross Children's Hospital & Groote Schuur Hospital, University of Capetown, Tygerberg Hospital, Univ. of Stellenbosch, Capetown. He has also worked as Pediatric Registrar/Fellow with Red Cross Children's Hospital in South Africa, as well as St Bartholomew’s Hospital London UK, and University of Virginia Charlottesville in the United States. Dr. Rogers has contributed a number of publications and journal articles, as well as book chapters and published peer reviewed abstracts in pediatric oncology. He has received several grants as a PI including NCCF grants, and Co-investigator CIHR & NCIC grants.

Dr. Ronald D. Barr

Dr. Ronald D. Barr

Professor of Pediatrics, Pathology and Medicine, Michael G. DeGroote School of Medicine. Formerly served as Chief of Hematology/Oncology, McMaster Children’s University, Ontario, Canada.

Ronald D. Barr is a pediatric cancer specialist known locally, nationally and internationally for his work in the field of pediatric oncology, as co-author and author of seven books and more than 250 scientific articles. After his medical training in internal medicine and hematology, Dr. Barr joined the Faculty of Medicine at the University of Nairobi as part of an arrangement with the UK government to establish the first medical school in Kenya. He then joined the faculty of the University of Aberdeen before moving to the National Cancer Institute in Bethesda, MD as a visiting scientist. Dr. Barr's main professional interests are international health, particularly relating to cancer in childhood; late effects of cancer treatment, especially on bone health and body composition; and measurement of health-status and health-related quality of life (as a co-developer of the Health Utilities Index). Dr. Barr is one of the editors of the first definitive document on the incidence, survival and mortality of 15 to 29 year-olds with malignant disease. Funded by the National Cancer Institute (NCI) in the United States, this monograph was a co-operative venture between the Children's Oncology Group (all 17 pediatric oncology centers in Canada and more than 200 American institutions) and the SEER (Survival Epidemiology and End Results) program. Dr. Barr also co-edited, with Dr. Archie Bleyer, the first textbook on Cancer in Adolescents and Young Adults, published in 2007. Dr. Barr is a member of the NCI and Lance Armstrong Foundation's Progress Review Group whose purpose is identifying and prioritizing the scientific, medical and psychosocial barriers facing adolescent and young adult (AYA) cancer patients, while developing strategies to overcome these obstacles. He is also co-chair of the Canadian national task force on AYA oncology.



Girish Chinnaswamy, MD

Girish Chinnaswamy, MD

Associate Professor of Pediatric Oncology, Department of Pediatric Oncology, Tata Memorial Hospital, Mumbai, India.

Dr. Girish Chinnaswamy completed his medical school and post graduate training in Pediatrics at Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER) Pondicherry, India.  He has subspecialty training in Pediatric and Adolescent oncology from the Royal London and Newcastle Upon Tyne Hospitals in the UK. He subsequently pursued research in Pediatric cancer pharmacology at the Northern Institute of Cancer Research, Newcastle University, UK. He has previously worked as a faculty member in Pediatric oncology at Christian Medical College hospital in Vellore, India. His special interests are Pediatric Neuro-oncology, solid tumors and bone tumors in children. He is a member of various societies including the Indian academy of pediatrics, International society of pediatric oncology (SIOP), Indian musculoskeletal oncology society (IMSOS) and Indian society of neuro-oncology (ISNO).

Maya Prasad, MD

Maya Prasad, MD

Assistant Professor of Pediatric Oncology, Department of Pediatric Oncology, Tata Memorial Hospital, Mumbai, India.

Dr. Maya Prasad is a MD in Pediatrics, and completed her fellowship in Pediatric Oncology in India. She has basic medical and pediatrics training at various centers across India. She also received subspecialty training at Christian Medical College in Vellore and Tata Memorial Hospital. Her interests lie in Pediatric Solid Tumors, Late Effects in Childhood Cancer, and Nutrition in Pediatric Oncology.


Amita Trehan, MD

Amita Trehan, MD

Professor of Pediatric Hematology Oncology, Postgraduate Institute of medical Education & Research (PGIMER), Chandigarh, India.

Dr. Amita Trehan is a MD in Pediatrics. She completed her specialty training in Pediatric and Adolescent Oncology, and Bone Marrow Transplantation, under the auspices of The Royal College of Pediatrics & Child Health, Newcastle Upon Tyne Hospitals, United Kingdom.



Sidharth K. Totadri, MD, DM

Sidharth K. Totadri, MD, DM

Senior Research Associate,Pediatric Hematology Oncology unit, Advanced Pediatric Center, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India.






Roberta Ortiz Sequeira, MD, MPH

Pediatric Hematology-oncology Department, La Mascota Children’s Hospital Managua, Nicaragua.

Roberta Ortiz Sequeira, MD, MPH

Roberta completed her Pediatric residency at La Mascota Children’s Hospital, the only center that provides treatment for childhood cancer in Nicaragua. She was trained in Pediatric Hematology Oncology as part of the twinning program between La Mascota Pediatric Hospital and hospitals in Monza and Milan in Italy. She is an active member of the Central American Association of Pediatric Hematology- Oncology (AHOPCA) and Monza’s International School of Pediatric Hematology-oncology, MISPHO.  She is a regular participant and organizer of St Jude Children´s Research Hospital group and Dana Faber Cancer Care Sarcoma Group to discuss patients and collaborative protocols (AHOPCA-Wilms, AHOPCA Osteosarcoma, and AHOPCA Non-B Non Hodgkin Lymphoma). Her interests lie in pain management and palliative care. She is working with National Ministry of Health in the development and training of National Palliative Care guidelines, and has been involved in the first National Palliative Care Program with the National Ministry of Health, MINSA, and Swiss NGO´s AMCA and Medicines du Monde. She is also participates in collaborative clinical research initiatives that promote the improvement in the delivery of Pediatric cancer care, in order to improve cure rates as well as quality of life of children with cancer in the area.

South Africa

Judy Schoeman, RD

Judy Schoeman, RD

Chief Dietician, Pediatric Oncology Unit, Steve Biko Academic Hospital, University of Pretoria, South Africa.

Her focus is on the Nutritional Care and management of pediatric patients in the hospital, as well as at home, to improve their nutritional status and therefore their prognosis. She also obtained a degree in accounting at the University of South Africa (UNISA), her Master's degree in Dietetics in Nutritional status of Pediatric Oncology patients at the University of the Free State, and a Diploma in Counseling at UNISA. Her interest are centered on ways to improve the lives and nutritional status of pediatric oncology patients for improved health and life expectancy.

Prof. Mariana Kruger

Prof. Mariana Kruger

Pediatric oncologist and ethicist, Professor and Executive Head of the Department of Pediatrics and Child Health,Tygerberg Hospital University of Stellenbosch, South Africa.

Dr. Kruger is past African Continental President for the International Society for Pediatric Oncology (SIOP). She is a founder member and co-principal investigator of South African Research Ethics Training Initiative (SARETI), funded by Fogarty International Center, NIH, USA, which aims to build African research ethics review capacity. She has served on several ethics review committees also as chair or deputy chair for the last 10 years, and is currently a member of the Stellenbosch University Senate Ethics Review Committee, and Health Research Ethics Committees of the Faculty of Medicine and Health Sciences, Stellenbosch University. Currently she serves as member of the Central Clinical Committee of the Medicines Control Council of South Africa (SA MCC), the Council of the College of Pediatricians of South Africa and executive committee member of the South African Children Cancer Study Group (SACCSG).

Peter Bernard Hesseling, MBChB, MMed(Ped), FCPSA(Ped), MD

Peter Hesseling

Emeritus Professor Peter Hesseling has been attached to the Department of Pediatrics and Child Health, Tygerberg Children’s Hospital, University of Stellenbosch, South Africa where he founded the pediatric haematology oncology service, since 1974, and served as chairman of that department from 1986 – 2001. He is a founder member of SIOP PODC and of the SIOP Africa Continental branch. He was instrumental in developing a pediatric oncology service in Namibia, pioneered safe low cost – effective treatment for Burkitt Lymphoma in Malawi, and has since 2003 developed a comprehensive children’s cancer treatment program at 3 Baptist mission hospitals in rural Cameroon. He has authored/co-authored > 100 peer reviewed scientific publications. His main current scientific interest is to promote the diagnosis, and to improve the outcome of treatment of children with cancer in low income African countries.     


Nicola Z. Mullen

Nicola Mullen

Nicola Z. Mullen is a founding member of IIPAN and a longtime advocate for global health.  Over the past twenty years, Ms. Mullen has been a supporter and advisor for non-profit organizations including The International Rescue Committee, More Than Me, and Mir Pace International.  Prior to devoting her time to philanthropic causes, she worked in international marketing for companies including Estee Lauder, Groupe SEB, and Honeywell.  She has also served on the boards of the Bereavement Center of Westchester and Concordia Conservatory. Ms. Mullen received a BA in English and Math from Dartmouth College and an MBA in Marketing and Non Profit Management from Columbia Business School.



Josephine Garvey, SRD, BSc, MSc

Josephine Garvey headshot

Josephine Garvey completed her BSc (Hons) degree in Nutritional Sciences/Nutrition & Dietetics (and hospital placement) in London in 1996. She went on to specialize in pediatric clinical nutrition, completing her “advanced pediatric practice” in London. She practiced as a pediatric clinical nutrition specialist at various London hospitals for 10 years, focusing on infant/childhood nutritional issues (including childhood food allergies, neonatal medicine, gastrointestinal, general pediatrics). She was also an invited lecturer for various under and post-graduate courses including the MSc in Food Allergy, Southampton University, UK & Pediatric Nutrition at the Royal Free Hospital, Medical School, London. In 2000 she undertook her masters in Nutritional Medicine at Surrey University, and presented her thesis on Prebiotics in children with Idiopathic Constipation (supervised by Dr J. Brown, Surrey University and Prof. Glenn Gibson, Reading University).

Josephine then spent 13 years working for the medical nutrition industry, where she was responsible for the pediatrics medical nutrition business within established and emerging markets. A major focus of her work was establishing partnerships with global experts, setting up stakeholder engagement activities and driving nutrition education and training. Josephine developed an extensive global network of experts and societies through her work.

Josephine has published various articles in her field of expertise, lectured at university level and has presented at national and international events on pediatric & infant nutrition/ nutrition support.