John O'Rourke

John O'Rourke

Chief Executive Officer and Chairman of the Board

Mr. O'Rourke is the Chief Executive Officer and Chairman of the Board of Directors of Riot Blockchain. Since 2011, he has also served as the Managing Member of ATG Capital LLC, an investment fund focused on small and mid-cap growth companies possessing distinct competitive advantages and superior management teams. Mr. O'Rourke serves on the Board of Directors of Mundo Inc., a leading global performance based marketing company that reaches more than two billion users per month. He received his Bachelor of Science in Accounting with an Honors Citation from the University of Maryland, College Park.

Rob Chang

Rob Chang

Chief Financial Officer

Mr. Chang comes to Riot from Cantor Fitzgerald, where he served as Managing Director and Head of Metals & Mining.

Mr. Chang has 23 years of experience in the financial services industry. He most recently served as the Managing Director and Head of Metals & Mining at a global investment bank where he provided research coverage in precious metals, base metals, lithium, and uranium. He was recognized by Bloomberg as the "Best Precious Metals Analyst" in Q1 2016. Mr. Chang is frequently quoted and a regular guest of several media outlets including: Bloomberg, Reuters, CNBC, and the Wall Street Journal.

Mr. Chang has previously served as a Director of Research and Portfolio Manager at a Canadian investment firm that managed $3 billion in assets. He was also on a five-person multi-strategy hedge fund team where he specialized in equity and derivative investments. Mr. Chang completed his MBA at the University of Toronto's Rotman School of Management.

Christopher Ensey

Christopher Ensey

Chief Operating Officer

Over the last 20 years, Chris Ensey has established himself as a cybersecurity expert and strategic executive. In 2012, he joined Dunbar Armored to launch their cybersecurity services practice. As Chief Operating Officer, he led a team of security professionals delivering industry leading capabilities to detect and remediate cyber-attacks across the globe. Prior to Dunbar, he served as Director of Government Solutions at SafeNet, where he was responsible for business development and marketing for their extensive suite of encryption and authentication products. At IBM, Mr. Ensey served as Principal Security Strategist for their federal division. He architected cybersecurity solutions for large scale enterprise environments leveraging IBM's extensive technology and services portfolio. Ensey has also held technical roles at SAIC and BEA Systems. He serves as an advisor to numerous cybersecurity and blockchain companies and has a BS in Computer Engineering from Virginia Tech. He has been actively using crypto based currencies since the earliest days of bitcoin. His most recent blockchain work has centered on applying distributed ledger technologies to solve complex information security and privacy challenges.

Daniel Robertsen

Daniel Robertsen

President of Digital Green Energy Corp

With more than 18 years of experience managing critical infrastructure for various high-tech industries, Mr. Robertsen was most recently Chairman and CEO of Bitfury Norway AS. Mr. Robertsen has also held positions as: Head of Critical and DC Facilities Management at Datacom Systems; Regional Facilities Operations Manager of Telenor AS/Hanesth Group; and the European Data Center's Operations Manager for Facebook Inc.

Jeffrey Vormittag

Jeffrey Vormittag

COO of Riot Blockchain Canada

Mr. Vormittag previously worked for over a decade in Canadian telecommunications, holding leadership roles in network service design and data center operations at Canada's second largest telecommunications provider. Jeffrey is an accomplished IT Project Manager in the areas of data center deployment and technology integration. Jeffrey holds a BA from the University of Waterloo and earned the PMI Project Management Professional designation in 2011. Mr. Vormittag was most recently Managing Director for Bitfury Canada.