About us

Medical Leadership

Dr. Aaron Aggarwal MD, FRCPC

Dr. Aggarwal graduated from medical school at the University of Alberta in 2004. Following this, he studied Internal Medicine at the Memorial University of Newfoundland before moving to Kingston and completing a fellowship in Respiratory Medicine at Queen’s University in 2009. During this time, he developed an interest in the impact of sleep on various breathing disorders and received the Henry Albert Beatty Fellowship to pursue a 1 year clinical fellowship in Sleep Medicine.
He joined MedSleep in 2012 and is currently the Medical Director for the Limestone City Sleep Lab in Kingston, the Carleton Place Sleep and PFT Clinic, and MedSleep Pembroke. His sleep medicine practice includes an affiliation with the Bariatric Centre of Excellence in Kingston. He also works as an Internal Medicine consultant at Kingston General Hospital and is an Assistant Professor at Queen’s University in the Department of Medicine.

Dr. Kathleen Ferguson BSc, MD, FRCPC

Dr. Kathleen Ferguson obtained her Doctor of Medicine from Western University in 1986 and subsequently trained in Internal Medicine and Respirology at Western.  She trained in Sleep Medicine at Western and UBC and joined Western’s Faculty of Medicine in 1994. Prior to her retirement from Western in 2012, Dr. Ferguson was active in sleep research, teaching, administration and clinical work. Her research interests were in the diagnosis and treatment of sleep disordered breathing in particular the role of oral appliance therapy.

During her academic career she was involved in many professional societies and presented widely at scientific conferences. She worked with the College of Physicians and Surgeons of Ontario in the development of clinical practice guidelines for Sleep Medicine. In 2020 she became the Medical Director for MedSleep Penticton.

Dr. Atul Khullar MD, MSc, FRCPC (Psychiatry), DABPN (Cert. Sleep Medicine)

Dr. Khullar is a psychiatrist who specializes in the combined management of sleep, mood and anxiety disorders, as well as sleep apnea in non-traditional populations.
He graduated from medical school at the University of Alberta and completed a sleep and mood disorders fellowship at the University of Toronto, as well as additional sleep medicine training at the University of Pennsylvania. Dr. Khullar is board-certified in Psychiatry and Sleep Medicine in both Canada and the United States. He is also a fellow of the American Academy of Sleep Medicine and a Clinical Assistant Professor at the University of Alberta.
He is the Medical Director at the Northern Alberta Sleep Clinic and MedSleep Edmonton South. He also consults at the Grey Nuns Hospital as well as MedSleep clinics across the country on a wide variety of topics related to the interactions between mood, anxiety and sleep.
Actively involved in research, Dr. Khullar has given more than 200 invited presentations to public and professional audiences worldwide. He also has provided sleep, anxiety and mood management strategies to organizations such as the Canadian Winter Olympic Team and the Edmonton Oilers.

Dr. Judith Leech, MD, FRCPC, D, ABSM

  • Respirologist with an interest in adult sleep medicine since 1983.
  • Trained in Sleep Medicine at the University of Illinois in Chicago under Dr. M. Lopata
  • Chief of the Civic Hospital sleep laboratory (1986-2003)
  • Certified American Board of Sleep Medicine (2003)
  • Former acting-Chief of Sleep Medicine at The Ottawa Hospital (2003-2007)
  • Medical Director of the Renfrew Victoria Hospital Sleep Laboratory
  • Co-Chair of the College of Physicians and Surgeons of Ontario task force on standards for sleep laboratories
  • Sleep Laboratory Assessor for the College of Physicians and Surgeons of Ontario
  • Past VP-Clinical of the Canadian Sleep Society
  • Principle Investigator on a number of pharmaceutical studies in sleep medicine and co-investigator with the Heart Institute on sleep apnea and the heart studies

Dr. Terrance Paul BSc (Hons.) MD, FRCP(C), FCCP

Dr. Paul is a board-certified specialist in Internal Medicine, Respirology and Intensive Care Medicine and an active Consultant in Sleep Medicine and Critical Care Medicine.  He is the Medical Director of MedSleep in Nanaimo and Prince George.  Dr. Paul is based on Vancouver Island, British Columbia and has active privileges at Royal Jubilee and Victoria General Hospitals.
Dr. Paul received his undergraduate Honour’s Physiology Degree from the University of Ottawa, then completed his Doctorate in Medicine at the University of British Columbia.  His residencies in Internal Medicine, Respirology and Critical Care Medicine were all completed at the University of Alberta.
When not practicing medicine Dr. Paul is a busy Father and Husband who enjoys fitness and photography.

Dr. Frank Ritacca MD, FRCPC

Dr Ritacca graduated from the University of Toronto Faculty of Medicine in 1999. He completed his post graduate training in Internal Medicine, Respirology, and Critical Care Medicine in 2005. He then obtained further training in Sleep Medicine and completed the American Board in 2009. He began working at Credit Valley Hospital in 2005 as a respirologist and critical care specialist. He also works as an assessor in sleep medicine for the college of physicians and surgeons of Ontario. Dr Ritacca joined Medsleep in 2005 initially at the Toronto location but has been exclusively at the Queensway Sleep Laboratory since 2012.

Dr. Avrum Soicher MD, FRCPC

Dr. Avrum Soicher MD FRCPC, is a physician licensed to practice in Ontario by the College of Physicians and Surgeons of Ontario. He has been practicing since 1993 and is an active staff member at the Brampton Civic Hospital. He was trained in sleep medicine from 1994-1995, during a fellowship appointment at various teaching hospitals under Dr. Patrick Hanly.
Since the inception of the Brampton Sleep Clinic in 1996, he has been the Medical Director and provides day-to-day direction and supervision of all facets of the facility operation. Dr. A. Soicher is also the Quality Advisor, and chairperson for the Quality Advisory Committee at the Brampton Sleep Clinic.
Dr. A. Soicher is proud to be part of the MedSleep team since June 2017 and looks forward to working and learning from his esteemed colleagues across Canada.

Dr. Ganesh Subramanian MD, FRCPC

Dr. Ganesh Subramanian obtained his medical degree from the University of Western Ontario and went on to complete his fellowship in Internal Medicine from McMaster University. Subsequently, he went on to complete additional fellowship training in Respirology from the University of Alberta and returned back to McMaster University to finish up his training in Sleep Medicine. He worked as a staff Respirologist at the Firestone Institute at St Joseph Hospital, Hamilton and switched gears to start a community practice as a general Internist at William Osler Health System – Brampton Civic Hospital. He is an active Respirologist in Brampton and continues to practice Sleep Medicine in Brampton, Mississauga (Queensway Sleep Lab) and is the Medical Director for MedSleep Milton. He has been a valued part of the MedSleep Medical family since July 2012.

Dr. Paul Teman MD, D.ABPN (Cert. Sleep Medicine)

Diplomate of the American Board of Psychiatry and Neurology-Certified in Sleep Medicine

Dr. Teman is a Board Certified Sleep Specialist. He treats patients (ages 18 and above) with all sleep disorders including obstructive sleep apnea, narcolepsy, restless legs syndrome, parasomnias, and insomnia.

He received his medical degree from the University of Minnesota. He has also completed a psychiatry residency followed by a sleep medicine fellowship at the Mayo Clinic.

Prior to practicing at MedSleep, Dr. Teman was the Medical Director of the Sleep~Wake Center at the University of Utah.

Dr. Jennifer Tiffney MD, FRCPC

Niagara Snoring and Sleep Centre/Medsleep, Medical Director
Sleep Medicine

Dr. Jennifer Tiffney treats patients (18 and above) with all sleep disorders including obstructive and central sleep apnea, narcolepsy, restless legs syndrome, parasomnias, and insomnia.
She received her medical degree from the University of Ottawa. She then completed her residency in psychiatry, and training in sleep medicine, at Western University in London, Ontario.
Dr. Tiffney is currently the Medical Director for Niagara Snoring and Sleep Centre/MedSleep Niagara Falls.

Dr. Alan Ong, MD, FRCPC, DABPN, DABSM, FAAN, FAASM

Dr. Ong obtained his Doctor of Medicine from the Faculty of Medicine at the University of Toronto and subsequently completed specialty training in Neurology and Sleep Medicine at the University of Toronto.
He is a Diplomate of the American Board of Sleep Medicine and a Fellow of the American Academy of Sleep Medicine. Dr. Ong has been a consultant sleep specialist at MedSleep/Toronto Sleep Institute Eglinton and Thornhill since our founding in 2004. He is also a consultant sleep specialist at the Sleep & Alertness Clinic and the York Region Sleep Disorders Centre. He served as the Medical Director of the Sleep & Alertness Clinic, Toronto Western Hospital, University Health Network (2006-2016) and is on the advisory board of the York Region Sleep Disorders Centre (2002-present).
Dr. Ong is active clinically managing a wide spectrum of sleep disorders. His areas of interest include nocturnal seizures, parasomnia, restless legs syndrome, narcolepsy, sleep apnea and its effects on the brain.