original: While at the Cowles Foundation, his research focused mainly on neo-classical growth theory, following the seminal work of Solow.
simplifications: At the Cowels Foundation, His research was mainly on neo-classical growth theory, after the important Solow work. While at the Cowles Foundation, he researched neo-classical growth theory, after that the seminal work of Solow. His research was on neo-classical growth theory. His research at the Cowles Foundation focused on neo-classical growth theory, following the pioneering work of Solow. While at the Cowles Foundation, his research focused mainly on neo-classical growth theory. It followed the seminal work of Solow. While at the Cowles Foundation, he focused mostly on neo-classical growth theory. At the Cowles Foundation, his research focus was on neo-classical growth theory, following the work of Solow. His research focused mainly on neo-classical growth theory while at the Cowles Foundation. During his time at the Cowles Foundation, his study was on neo-classical growth theory, like the work of Solow. While he was at the Cowles Foundation, his research focused mainly on neo-classical growth theory, following the seminal work of Solow.