After writing for several television series, including 21 Jump Street, Glassner moved on to The Outer Limits, which naturally segued into his involvement with Stargate SG-1 as a staff writer and executive producer.
Nakon pisanja za nekoliko televizijskih serija uključujući i 21 Jump Street, Glassner prelazi na The Outer Limits, što dovodi do njegovog angažmana na Stargate SG-1 kao pisca i izvršnog producenta.