Tavistock Clinic summary:

Founded 1920 by Hugh Chrichton-Miller, a psychiatrist. Meant to address and fix mental problems in veterans of the first world war. Expanded from that to "preventative psychiatry, expertise in group relations (including army officer selection), social psychiatry, and action research".

The Tavistock Institute broke away from Tavistock Clinic in 1946, to focus specifically on group and organizational behaviour.

The notable individuals involved in Tavistock Clinic, per wiki:

Eric Trist (Deputy Chairman of Tavistock Institute)
Psychologist, part of the "Tavistock Group" - researchers/specialists who founded the Tavistock Institute. "Trist was heavily influenced by (((Kurt Lewin))), whom he met first 1933 in Cambridge, England. Kurt Lewin had moved from studying behaviour to engineering its change, particularly in relation to racial and religious conflicts, inventing sensitivity training, a technique for making people more aware of the effect they have on others, which some claim as the beginning of political correctness.

This would later influence the direction of much of work at the Tavistock Institute, in the direction of management and, some would say, manipulation, rather than fundamental research into human behaviour and the psyche. It was a partnership between Trist's group at the Tavistock, and Lewin's at MIT that launched the Journal 'Human Relations' just before Lewin's death in 1947."

Isabel Menzies Lyth (Psychoanalyst, Tavistock Institute)
"British psychoanalyst in the Kleinian tradition, best known for her work on unconscious mechanisms in institutional settings."

J. D. Sutherland (Medical Director, Tavistock Clinic)
"British psychoanalyst and theorist, published a number of articles on pychoanalytic subjects, from object relations theory to group therapy, both singly and co-authored. His work in the States played a significant part in opening up ego psychology to the object relations tradition."

Edward John Mostyn Bowlby (Deputy Director, Tavistock Clinic)
"British psychologist, psychiatrist, and psychoanalyst, notable for his interest in child development and for his pioneering work in attachment theory."

John Rawlings Rees (Medical Director and co-founder, Tavistock Clinic)
British civilian and military psychiatrist. "The work which occupied most of Rees time during the war was the case of Rudolf Hess. Together with Henry Dicks, a fellow member of the Tavistock Clinic group, Rees was charged with the care of Hitler's Deputy at the secret prison locations where he was held following his capture after landing in Scotland. Over the four-year period from June 1941 to Hess' appearance at the Nuremberg trial, Rees apparently established a relationship with Hess: Hess' diaries record many meetings with Rees, referred to at this time as Colonel Rees, in which Hess accused his captors of attempting to poison, drug, and 'mesmerise' him. In 1945 Rees was a member of the three-man British panel (with Churchill's personal physician Lord Moran, and eminent neurologist Dr George Riddoch) which assessed Hess's capability to stand trial for war crimes."

"After the war, the Tavistock Clinic underwent considerable changes, in which Rees played a key role. He was a member of a group who referred to themselves as the ‘invisible college’, in reference to the 17th century precursor to the Royal Society. This group orchestrated ‘operation phoenix’, making plans for the Tavistock to rise from the ashes of war. After the war, this group including Rees and five others formed the Interim Planning Committee of the Tavistock. This committee was chaired by Wilfred Bion, meeting twice a week to formulate a new way forward for their work at the Tavistock, based on war-time experience. Rees’ plans for the Institute of Medical Psychology were never realised; instead, the group went on to found the Tavistock Institute, with funding from the Rockefeller Foundation."

Henry Victor Dicks (Asst. Medical Director, Tavistock Clinic)
"British psychiatrist. He drew on his wartime experiences, which included the medical care of Rudolf Hess, to develop views on authoritarian personality and the collective psychopathology of authoritarian regimes. From 1942 to 1944 he advised Military Intelligence on German morale; from 1944 to 1945 he advised SHAEF on psychological warfare; and from 1945 to 1946 he advised the Control Commission for Germany on de-Nazification."

John Rickman (Clerk Asst., British House of Commons)
"English government official and statistician of the early nineteenth century. Rickman is credited with drafting the first bill which became the 1800 Census Act, the full title of which was An Act for taking an Account of the Population of Great Britain, and of the Increase or Diminution thereof, which became law in December 1800. Rickman was instrumental in carrying out the first four censuses of Great Britain, including not only a population count, but also the collection and analysis of parish register returns."

Henry Ezriel (Consultant Psychiatrist, Tavistock ___ (unclear))
"Kleinian analyst who pioneered group analysis at the Tavistock Clinic. He is perhaps best known as the originator of one of the Malan triangles (a way of illuminating the phenomenon of transference (Transference is a phenomenon characterized by unconscious redirection of feelings from one person to another. One definition of transference is "the inappropriate repetition in the present of a relationship that was important in a person's childhood".) in psychotherapy, both brief and extended.) Ezriel influentially proposed using what he called a “three part interpretation”, including the three key areas of adaptation, desire and anxiety. He highlighted the patient's required or conformist relationship to the group, which was seen as a defence against the wished-for relationship, a defence in turn driven by fear of an imagined catastrophic relationship."

Martha Harris (Head of Child Psychotherapy, Tavistock Clinic)
"British Kleinian psychoanalyst of children and adults. Harris was responsible for the subsequent expansion in the number of English and international trainees at the Tavistock, and for laterally developing the training into what became known as the Tavi Model. (OP note: Initial googling on tavi model isn't turning up anything - look into) This model, in which infant observation continues to play a pre-eminent role, has been adopted, with modifications, in other European countries and in South America."

Michael Balint (Unclear, Tavistock Clinic and Institute)
"Hungarian psychoanalyst who spent most of his adult life in England. Proponent of the Object Relations school. In 1949 Bálint met Enid Flora Eichholz, who worked in the Tavistock Institute of Human Relations with a group of social workers and psychologists on the idea of investigating marital problems. Michael Balint became the leader of this group and together they developed what is now known as the "Balint group": a group of physicians sharing the problems of general practice, focusing on the responses of the doctors to their patients."

Enid Balint (unclear, unclear)
"British psychoanalyst and welfare worker. Her new husband was known for his academic study of the doctor-patient relationship. Today it is considered that he and Enid had an equal influence of the scientific understanding of this important relationship. They developed the idea of treating a married couples, who had issues, separately but in parallel with the husband and the wife having different therapists. They called this the case discussion seminar and it led to ???? Her husband suffered from diabetes and glaucoma and she assisted him unbeknown whilst her was walking." (OP Note: The last sentence is really weird, doesn't look written by native english author - look into further)

Pierre Maurice Turquet (Consultant Psychiatrist, Tavistock Clinic)
"English psychiatrist based at the Tavistock Clinic with an interest in group relations."

Ros Draper (Senior Clinical Lecturer, Tavistock Clinic)
"Therapist, supervisor, teacher, and writer, and has made major contributions to the development of family therapy in Britain. In 1988 Ros co-founded the influential Systemic Thinking and Practice Book Series and her title Teaching Family Therapy (1993) remains a key text in the field. More recently Ros has developed ways of using family therapy and systemic practice in primary care and educational settings and, in addition to her private practice, is a member of the teaching and therapy team at the renowned Family Institute, Cardiffand at the Juniper Centre, an eating disorders service in Southampton."

Wilfred Ruprecht Bion (Chairman(?), Tavistock Clinic and Institute)
"British psychoanalyst, who became president of the British Psychoanalytical Society from 1962 to 1965. Bion has been twinned with Jacques Lacan as "inspired bizarre analysts...who demand not that their patients get better but that they pursue Truth". 'Bion's ideas are highly unique', so that he 'remained larger than life to almost all who encountered him'. He has been considered by Neville Symington as possibly "the greatest psychoanalytic thinker...after Freud". The entire group at Tavistock had in fact been taken into the army, and were working on new methods of treatment for psychiatric casualties (those suffering post-traumatic stress, or "shell shock" as it was then known.) Out of this his pioneering work in group dynamics, associated with the "Tavistock group", Bion wrote the influential Experiences in Groups, London: Tavistock, 1961. Experiences in Groups was an important guide for the group psychotherapy and encounter group movements beginning in the 1960s, and quickly became a touchstone work for applications of group theory in a wide variety of fields. He joined a research group of Klein's students (including Hanna Segal and Herbert Rosenfeld), who were developing Klein's theory of the paranoid-schizoid position, for use in the analysis of patients with psychotic disorders, and became a leading member of the Kleinian school. He produced a series of highly original and influential papers (collected as "Second Thoughts", 1967) on the analysis of schizophrenia, and the specifically cognitive, perceptual, and identity problems of such patients. "

Donald Meltzer (unclear, unclear)
"Kleinian psychoanalyst whose teaching made him influential in many countries. He became known for making clinical headway with difficult childhood conditions such as autism, and also for his theoretical innovations and developments. His focus on the role of emotionality and aesthetics in promoting mental health has led to his being considered a key figure in the "post-Kleinian" movement associated with the psychoanalytic theory of thinking created by Wilfred Bion. Initially his work with children was supervised by Esther Bick, who was creating a new and influential mode of psychoanalytical training at the Tavistock Institute based on mother-child observation and following the theories of Melanie Klein.[5] As a result of the regular travels and teaching of Meltzer and Martha Harris (his third wife), who was head of the Child Psychotherapy Training Course at the Tavistock, this model of psychoanalytic psychotherapy training became established in the principal Italian cities, and in France and Argentina."

Neville Symington (unclear, Tavistock Clinic)
"Portuguese Catholic priest before becoming a psychoanalyst. Member of the Middle Group of British Psychoanalysts which argues that the primary motivation of the child is object-seeking rather than drive gratification. He has published a number of books on psychoanalytic topics, and was President of the Australian Psychoanalytical Society from 1999 to 2002. Symington is perhaps best known for his work on narcissism, which he considered to be the central psychopathology underlying all others."

Mary Dinsmore Salter Ainsworth (unclear, Tavistock Clinic)
"American-Canadian developmental psychologist known for her work in early emotional attachment with the Strange Situation design, as well as her work in the development of attachment theory. While in England, Ainsworth joined the research team of John Bowlby at the Tavistock Clinic, investigating the effects of maternal separation on child development. Comparison of disrupted mother-child bonds to normal mother-child relationship showed that a child's lack of a mother figure lead to "adverse development effects." On the basis of their behaviors, the 26 children in Ainsworth's original Baltimore study were placed into one of three classifications. Each of these groups reflects a different kind of attachment relationship with the caregiver, and implies different forms of communication, emotion regulation, and ways of responding to perceived threats."

John Steiner (unclear, unclear)
"A psychoanalyst, author and trainer at the British Psychoanalytical Society. Steiner, a 'prolific London post-Kleinian', is best known for his conceptions of the "pathological organisation" or the "psychic retreat"...between the paranoid-schizoid and the depressive positions'. His book Psychic Retreats describes a treatment methodology for patients with complex defence mechanisms that are difficult to treat with conventional psychoanalysis.

Names currently unresearched:
Sylvia Payne, Arthur Hyatt Williams, A. K. Rice, Eric Miller, Ian Dishart Surttie, Esther Bick, Robert H. Gosling, Rosemary Whiffen, Anton Obholzer, Margot Waddell, Peter Hobson and Margaret Rustin.