Ledermann was born in 1908 to Jewish parents in Berlin.[1] He studied medicine at the University of Freiburg and took interest in philosophical vitalism.[2] He attended a lecture of Alfred Adler and was deeply influenced by his work. He also took influence from Jan Smuts' book Holism and Evolution.[1] In 1932, he obtained his MD from the University of Freiburg.
He fled Nazi Germany in 1933 to become House Physician at Glasgow Homeopathic Hospital.[3] He qualified at L.R.C.P. Edinburgh in 1934.[4] He moved to London in 1935 to start his own medical practice. In 1936, he joined the Nature Cure Clinic where he practiced for over 50 years.[3] He worked at the Children’s Homoeopathic Dispensary in Shepherds Bush for 20 years and joined the Royal London Homeopathic Hospital where he became consultant physician in 1965. He was a psychiatrist at Marlborough Day Hospital.[3]
Ledermann developed a type of psychotherapy he termed "true-self psychotherapy", which aimed to make "the unconscious conscience conscious".[3] He took a holistic approach to medicine and authored several books on the topic.[1] He opposed the "mechanistic materialism" of orthodox medicine. His holistic
medicine was derived from existential and phenomenological philosophy.[6] During his later years Ledermann researched acupuncture and in 2001 received an honorary membership of the Chinese Medical Institute and Register.[7]