Daniel de Vise:

Mike Greiner teaches grammar to high school sophomores in half-hour lessons, inserted between Shakespeare and Italian sonnets. He is an old-school grammarian, one of a defiant few in the Washington region who believe in spending large blocks of class time teaching how sentences are built.
For this he has earned the alliterative nickname “Grammar Greiner,” along with a reputation as one of the tougher draws in the Westfield High School English department.
Or, as one student opined in a sonnet he wrote, “Mr. Greiner, I think you’re torturing us.”
Greiner, 43, teaches future Advanced Placement students at the Chantilly school. Left on their own to decide where to place a comma, “they’ll get it right about half of the time,” he said. “But half is an F.”
Ten or 20 years ago, Greiner might have been ostracized for his views or at least counseled to keep them to himself. Grammar lessons vanished from public schools in the 1970s, supplanted by a more holistic view of English instruction. A generation of teachers and students learned grammar through the act of writing, not in isolated drills and diagrams.
Today, Greiner is encouraged, even sought out. Direct grammar instruction, long thought to do more harm than good, is welcome once more

One of my high school English teachers was just like Greiner.