Lachlan received her Doctorate of Naturopathic Medicine (ND) from the Canadian College of Naturopathic Medicine, and a certificate in Contemplative Psychotherapy from the Nalanda Institute of Contemplative Science. She completed an advanced fellowship training in Integrative Psychiatry with Dr. James Greenblatt MD. She is Director of Integrative Medicine at Walden Behavioral Care, an inpatient and residential facility for eating disorders and psychiatric conditions in Massachusetts. She also sits on the board of the Psychiatric Association of Naturopathic Physicians (PsychANP) and is co-founder of Water and Wood, an experiential integrative medicine company offering custom retreats and workshops for groups.

Prior to her medical training she completed a BSc Hons titled Ecological Determinants of Health at McGill University in the School of Environment. She is a registered ND in Massachusetts, California, and Ontario Canada.