Who are some of today's leading author experts on parenting advice?

Some of the leading authors today who are writing about parenting are Armin Brott, Alyson Schafer, Robert Sears, David and Jan Stoop, Malcom and Laura Gauld. Some of the parenting experts who have written in the past such as Dr. Brazelton, Dr. Sears and Foster Cline are still relevant to the present.