He is known for his involvement with Stargate SG-1, where he was executive producer for the first three seasons, and The Outer Limits.

Glassner was initially noticed as a writer for his work on Alfred Hitchcock Presents.

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.

[citation needed] He moved to Los Angeles to become a director and was told that the best way to accomplish that was to start out as a writer.

[1] His daughter Samantha Glassner also appears on his series The Ark as the mysterious character of Kelly.