serving in two dual capacities, serving in two posts concurrently

serve in two jobs or positions of responsibility concurrently, double as A and B

teacher

add, sum up / inflict, do harm / include, count in / increase

a cautionary tale, an example of what not to do / a person who serves as a living example of what to avoid

besides, on top of, in addition

director / board of directors

a job; an occupation; work / job, work (task) / (physics) work, change of energy

to work

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend