Martin is a founding member of INSA and leading psychologist in the Clinic for Child and Adolescent Psychiatry, Psychosomatics, and Psychotherapy, in Essen, Germany. He is the head of a specialized outpatient unit for youths absent from school, and head of an inpatient unit for youths absent from school and experiencing mental health problems. With colleagues, he developed and evaluated a multi-modular intervention for school absenteeism. He also works with the University of Duisburg-Essen.

Martin is the author of a new questionnaire to better understand the needs of youth absent from school, called the Inventory of School Attendance Problems (ISAP). He conducts research on the reliability and validity of the questionnaire; the prevention of school absenteeism; and the implementation of schema therapy for youths whose absence is associated with a mental health problem. Martin’s background includes a Master’s Degree in Psychology and a PhD in Educational Psychology. He is a certified child and adolescent cognitive-behavioural therapist.