Shaun Attwood is a former drug smuggler who ran a successful ring trafficking MDMA pills in the US in the '90s. He's been dubbed "the Walter White of the ecstasy market in Arizona," and he was arrested in 2002 and served six years in US jail. 

Attwood speaks to Insider about how ecstasy is processed, smuggled, and sold. He recounts his work with the New Mexican Mafia and rivalries with "Sammy the Bull" Gravano and the Gambino crime family. He also speaks about sentencing, life in US jails, and extradition. 

He has been featured on "Locked Up Abroad," and he has his own YouTube series interviewing former offenders. Attwood published his life story as the "English Shaun Trilogy" and speaks to audiences around the UK and Europe about prison reform.