Edgar Schein

Edgar Henry Schein (born March 5, 1928), a former professor at the MIT Sloan School of Management, has made a notable mark on the field of organizational development in many areas, including career development, group process consultation, and organizational culture... Schein's model of organizational culture originated in the 1980s. Schein (2004) identifies three distinct levels in organizational cultures: artifacts and behaviours; espoused values; assumptions... https://en.wikipedia.org/wiki/Edgar_Schein