What makes a teacher great? Dr. Marvin Thompson, the new principal of John McDonogh High School in New Orleans — and star of the new OWN docu-series “Blackboard Wars” — shared four often-overlooked signs with OWN, the Huffington Post reports. (And he should know about great teachers: In his previous post as superintendent of the Roanoke City Public Schools, Dr. Thompson increased the number of accredited schools by 25 percent, closed the No Child Left Behind achievement gap and increased the number of students scoring “Passed Advanced” on the Virginia assessment tests…)

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