In 1993 he co-authored wrote the influential Die Wiederentdeckung der Nutzpflanze Hanf (The Rediscovery of the Agricultural Crop Hemp) with Jack Herer.
Jack Kerouac | Jack Nicholson | Jack Nicklaus | Jack the Ripper | Jack London | Jack Kemp | Jack Kirby | Jack Lemmon | Jack Black | Jack Abramoff | Jack Dempsey | Jack Benny | Jack White | Wolfman Jack | Union Jack | Jack White (musician) | Jack and the Beanstalk | Jack Johnson | Jack Charlton | Jack Palance | Jack Daniel's | Jack | Jack Paar | Jack Layton | Jack Straw | Jack Vance | Jack Bruce | Jack Warden | Jack's Mannequin | Jack in the Box |
An occasional writer for lewrockwell.com and Campaign for Liberty, he is one of the four founders of the Foundation to End Drug Unfairness Polices (FED-UP), an anti-drug war organization that sponsors speeches by Jack Herer, Ed Rosenthal, Judge Jim Gray, Valerie Corral, and Lynnette Shaw, and provided support to medical marijuana clinics.