The phrase "to join the profession" means to become a part of a specific occupation or career field, usually through education or training. Full definition
Young lawyers joining the profession shouldn't discount the need for their services. (canadianlawyermag.com)
Regardless of why teachers join the profession or how long they intend to stay, it's clear that qualifying for a pension is not enough to keep them in it. (educationnext.org)
She also sought advice about joining the profession from clinical doctors and genetic counselors. (sciencemag.org)