He is engrossed in his profession.
a confrère
the act of specializing
{that} field of speciality
to make a special study of―made a specialty of―make a study of―a subject
He is engrossed in his profession.
He is engrossed in his profession.
He is engrossed in his profession―devoted to his profession.
He is devoted to his profession―enthusiastic in his profession.
He is engrossed in his profession.
a female employee who has a professional skill
a person who specializes in something
He is engrossed in his profession.