About Us

The Hidden Mobility Disabilities Alliance (HMDA) Board of Directors came together in March 2017 to launch this non-profit out of a passion for ensuring that all people can participate in community life to the fullest. Hidden mobility disabilities are truly invisible, and we hope that we can engage the full range of relevant parties to join us in increasing accessibility for those with hidden mobility disabilities (or limited mobility).

About Our Founder

This website and research was started by Dr. Dorothy Riddle, a certified management consultant with a doctorate in clinical psychology and a doctoral minor in statistics and research methodology. Dr. Riddle grew up hiking in the Himalayan mountains of northern India and then the national parks in the U.S. and Canada. As her osteoarthritis progressed, she gradually had to cut back on her outdoor activities and ultimately had to use a cane in order to get around.

As a social justice advocate most of her professional life, she challenged Air Canada in 2004 for inadequate provision of wheelchair assistance and was successful in obtaining a Transport Canada ruling requiring better staff training and consistent implementation of the federal regulations regarding assistance to passengers with disabilities.

In 2016, while trying to advocate for accessibility in public facilities, she became aware that no guidelines existed for accommodation of persons with hidden mobility disabilities. Regulations such as building codes focus on maneuverability for persons using wheelchairs or scooters but overlook the distance issues that are a primary barrier for persons with hidden mobility disabilities. As she contacted researchers and disability advocates groups and government departments responsible for disability research and accommodation of persons with mobility disabilities, it became clear that no detailed data existed on persons with hidden mobility disabilities and therefore there were no guidelines for accommodation.

So in March 2017 she began commissioning research on the lived experience of those struggling with limited mobility. Over 3,500 people have participated to date, and a June 2022 population survey in Canada determined that 13 percent of the adult population struggle with limited mobility.