Rivera later edited and published "Wolfgang Luthe Introductory Workshop: Introduction to the Methods of Autogenic Training, Therapy and Psychotherapy".
During his time in Canada, he worked at Montreal General Hospital, Québec, where he founded the Pychosomatic Unit.
Back in Spain he worked at Clínica Puerta de Hierro in Madrid while still teaching, first as Adjunct Psychiatry Professor Ad Honorem at the Universidad Autónoma de Madrid promoting "serial meetings for medical students on psychosomatic medicine and psychotherapy of functional disorders.
In 2010, he was invited by Spanish newspaper El Mundo to answer readers questions in a digital encounter.
[4] Rivera also works as consultant for the Instituto Español de Resilencia (Spanish Resilience Institute) dedicated to reducing workplace stress and psychosocial risks derived from it.