Mark P. Wetjen is an American lawyer and regulatory expert. Nominated by President Barack Obama in February 2011 and confirmed by the Senate in August 2011, he served as a Commissioner of the Commodity Futures Trading Commission (CFTC) until April 2014. During this period, he acted as the agency's Chairman from June to November 2014, following Gary Gensler's resignation, overseeing key decisions on derivatives markets and Dodd-Frank implementation amid intense regulatory scrutiny post-2008 financial crisis. Prior to the CFTC, Wetjen held positions including Chief of Staff to CFTC Commissioner Michael Dunn and roles at the U.S. Senate Committee on Agriculture, Nutrition, and Forestry. After leaving government service, he practiced law at Willkie Farr & Gallagher LLP before joining FTX US in 2021 as Head of Policy and Regulatory Strategy. Following the FTX collapse in late 2022, amid widespread allegations of fraud against founder Sam Bankman-Fried, Wetjen transitioned to his current role as a partner at the international law firm Dentons, focusing on financial services and commodities regulation. His career bridges government regulation and private sector crypto policy, drawing criticism from some for moving between regulatory roles and industry positions potentially involving conflicts of interest.