Siebert has studied Salvia divinorum for over twenty years and was the first person to unequivocally identify (by human bioassays in 1993) Salvinorin A as the primary psychoactive principal of Salvia divinorum. In 1998, Siebert appeared in the documentary Sacred Weeds shown in the United Kingdom. He has discussed Salvia divinorum on National Public Radio, Fox News, CNN, Telemundo and his comments have appeared in the Los Angeles Times, USA Today, and The New York Times.
In 2002, Siebert wrote a letter to the United States Congress in which he objected to bill H.R. 5607 introduced by Rep. Joe Baca (D-California) which sought to place Salvia divinorum in Schedule I of the Controlled Substances Act.
- "Daniel J Siebert's Home Page". Retrieved 2015-04-21.
- "Ska Pastora -- Leaves of the Sherpherdess" (Conference at Breitenbush Hot Springs, by Ian Soutar). MAPS: Multidisciplinary Association for Psychedelic Studies. 2000-12-07. Retrieved 2009-10-09.
- Marushia, Robin (June 2003). "Salvia divinorum: The Botany, Ethnobotany, Biochemistry and Future of a Mexican Mint" (PDF). Ethnobotany. Archived from the original (– Scholar search) on October 7, 2007. Retrieved 2007-05-04. Check date values in:
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- Schaper, David (2006-03-20). "Legal, Herbal Hallucinogenic Draws Teens, Critics". NPR. Retrieved 2007-07-24.
- "New Recreational Drug Poses Questions For DEA" (Interview by Anderson Cooper). CNN. 2003-06-24. Retrieved 2007-07-24.
- Siebert, Daniel. "Daniel Siebert's letter to Congress". CognitiveLiberty.org. Retrieved 2006-12-05.