Eric was primarily a builder when he hired Roy Case as the architect of Minisceongo in the early 1990's. He developed his design "chops" working with Roy on that project, then again with Roy on New Jersey National in the mid 90's.
Having worked with Fazio and other architects as well, he eventually started doing more of the work himself.
I do know for a fact he did use Roy in some capacity at Bayonne, which makes sense considering Roy has been coined "the Lord of the Landfills" by Links Magazine.