He left both Gretchen and Gray Matter Technologies , selling his financial interest in the company for $5,000 .
Around this time , Walt dated his lab assistant , Gretchen ( Jessica Hecht ) .
Walt left both Gretchen and Gray Matter Technologies , selling Walt 's financial interest in the company for $5,000 .
Around this time , Walt dated his lab assistant , Gretchen ( Jessica Hecht ) .