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G. Stanley Hall
received the first American Ph.D. in psychology. He later founded the American Psychological Association. -
Wilhelm Wundt
founded the first formal laboratory of Psychology at the University of Leipzig, marking the formal beginning of the study of human emotions, behaviors, and cognitions. -
William James
published 'Principles of Psychology,' that later became the foundation for functionalism. -
G. Stanley Hall
Foundation of the American Psychological Association (APA) headed by G. Stanley Hall, with an initial membership of 42. -
Alfred Binet
founded the first laboratory of psychodiagnosis. -
Lightner Witmer
opens the first psychological clinic in the United States, focusing on the assessment and treatment of individuals with learning difficulties. -
William Stern
developed the original formula for the Intelligence Quotient (IQ) after studying the scores on Binet's intelligence test. -
Psychological Corporation
launched the first psychological test development company, not only commercializing psychological testing, but allowing testing to take place at offices and clinics rather than only at universities and research facilities. -
Herman Rorscach
develops the Rorschach inkblot test, a projective psychological test used to assess personality traits and psychopathology. -
Mary Whiton Calkins
becomes the first female president of the American Psychological Association (APA). -
Ethical Code of Conduct
The APA publishes the first edition of the "Ethical Standards of Psychologists," establishing ethical guidelines for the profession. -
Carl Rogers
published 'Counseling and Psychotherapy' suggesting that respect and a non-judgmental approach to therapy is the foundation for effective treatment of mental health issues. -
Legislation for Psychologists
The state of Connecticut passed licensure legislation for psychologists, becoming the first state to recognize psychology as a protected practice oriented profession. -
Mental Disorders
The Diagnostic and Statistical Manual of Mental Disorders (DSM) was published by The American Psychiatric Association marking the beginning of modern mental illness classification. -
First Doctor of Psychology
First Doctor of Psychology (Psy.D.) professional degree program in Clinical Psychology was established in the Department of Psychology at The University of Illinois - Urbana/Champaign. -
APS
American Psychological Society established. -
Congress of Positive Psychology
The first International Congress of Positive Psychology takes place, promoting research on positive aspects of human functioning. -
Martin Seligman
becomes president of the American Psychological Association and elevated Positive Psychology to the forefront.