Grilled Chicken Corn Chowder

Name: Grilled Chicken Corn Chowder
Ingredients: 4 grilled chicken breasts, ((1 1/4 #, approximately 4 cups pulled chicken/567 grams)); 1 1/2 cups chopped celery, 5-6 stalks ((6 ounces/170 grams)); 1 1/2 cups sliced leeks, 2 leeks ((6 ounces/170 grams)); 3 cups large diced potatoes ((1#/454 grams)); 5 ears corn ((3 ½ cups/1# 3 ounces/538 grams)); 4 tablespoons unsalted butter; 4 tablespoons flour; 5 sprigs thyme; 1 bay leaf; 2 cups chicken stock ((473 ml)); 3 cups whole milk ((710 ml)); 2 tablespoons diced chives, parsley, or cilantro; 2 teaspoons kosher salt; ½ teaspoon ground black pepper