One of my favorite teachers at Choate, Mr. Yankus, had a similar warning against using the verb “to be” in any essay.
But embarrassed administrators at Choate have been in lockdown on disclosing details.
So we have a graduate of Choate or Beverly Hills High who attends Wharton, and goes to work for, say, Goldman Sachs.
"finished, complete," mistaken back-formation from inchoate (q.v.) as though that word contained in- "not." First attested 1878 in letter from Oliver Wendell Holmes lamenting barbarisms in legal case writing (he said he found choate in a California report).