what is the name and position of the head whose department has least number of employees?
SELECT T2.name ,  T2.position FROM department AS T1 JOIN physician AS T2 ON T1.head  =  T2.EmployeeID GROUP BY departmentID ORDER BY count(departmentID) LIMIT 1;
head whose department has least number of employees refers to MIN(count(employees)); name and position of the head refers to selecting name and position from a join between department and physician tables where department head matches employee ID;