[1] He has also appeared on other shows such as the Outdoor Channel's Buck Commander and The Duckmen of Louisiana, and was the eponymous host of the Duck Dynasty spin-off Going Si-Ral.

Si has also made a guest appearance on Last Man Standing, and in Big Idea Entertainment's Veggie Tales episode Merry Larry and the True Light of Christmas as Silas the Narrator.

He has four brothers, Jimmy Frank, Harold, Tommy, and Phil (who was born 2 years before him), and two sisters, Judy and Jan. Because of financial setbacks of their family during Si and his siblings' childhoods, the Robertson family lived in rugged conditions with significantly fewer amenities than the average American enjoyed.

[7] Upon retirement from the Army in 1993, Si found employment at his brother Phil's Duck Commander business.

Si thinks that it is an easy job and is depicted in Duck Dynasty as having difficulties staying on task; he often seeks breaks to take a nap or play around with equipment in the warehouse.

"[9] Robertson lent his voice and personal appearance to the VeggieTales video Merry Larry and the True Light of Christmas, in which he narrates the video and appears as a mall janitor, in the tradition of the mid 1960s and early 1970s Rankin/Bass Christmas specials and their use of celebrity narrators.

He is perhaps the most well-known and recognized character of the bunch, due to the frequency and quality of his jokes and stories, as well as his general manner.

His spontaneous nature often launches the plot of the show into action, whether handcuffing himself to his nephew Willie or spending the prize money of $2,000 at a children's arcade.