A "write-up" regarding a Headmaster can take several forms depending on your goal. It might be a biographical profile for a school yearbook, a formal letter/application addressed to them, or a descriptive essay for a class assignment.
One of the most common questions in education forums is: What is the difference between a Headmaster and a Principal? Headmaster
I was summoned to that office exactly three times during my secondary school years. And while I remember very few of my actual lessons, I remember every grain of wood on that door. A "write-up" regarding a Headmaster can take several
A final trend worth noting is the semantic shift. Many schools are dropping the gendered and hierarchical term in favor of "Head of School," "Principal," or "Lead Learner." a formal letter/application addressed to them