What is the education required for David Whitehead to reach his current position?
David Whitehead is the full name of an employee; full name = firstname, lastname
SELECT T2.educationrequired FROM employee AS T1  INNER JOIN position AS T2  ON T1.positionID = T2.positionID WHERE T1.firstname = 'David' AND T1.lastname = 'Whitehead' AND T1.gender = 'M'