He did his psychiatric residency studies at the Colorado Psychopathic Hospital which positioned him as one of the best-known psychiatrists globally with expertise applied across various fields within his profession.

[3][4][5][6] Felix worked in a variety of mental health settings after finishing his internship and residency in psychiatry at the University of Cincinnati.

He began his career in the Public Health Service in 1933 as an assistant surgeon at the Medical Center for Federal Prisoners in Springfield, Missouri.

During World War II, he served at the U.S. Coast Guard Academy in New London, Connecticut, first as staff psychiatrist and then as senior medical officer.

[7] During his tenure as director of NIMH, he aimed on developing the country's mental health strategies with an emphasis on research, treatment, and prevention.

One of these was "How to Live with Job Pressure", printed in Nation's Business back in 1956, which showed how he painted current's issues before readers through refreshing ideas.

[12][13] He also promoted the disbanding of asylums as well as therapy delivered in neighborhoods including donation of money for studies uncovering cellular origins behind madness.

The accolades demonstrated Felix's dedication, expertise, and leadership in the field of psychiatry, and his lasting impact on the mental health community.