Dave began his entrepreneurial career in 2004 by inventing the first all-glass gravity bong, the Gravitron, an instant success that has become a cult classic. Since the Gravitron, Dave has designed or led the Grav design team to bring over 500 unique top-line products to the cannabis market. In 2020, Grav launched pre-filled Glass Joints in California in collaboration with Eel River Organics, the brand's first entry into consumables.