To enable data governance programs to be successful it is important to establish the key roles and define the responsibilities within those.
Chief Data Officer - a corporate officer responsible for enterprise-wide governance and utilization of information as an asset, via data processing, analysis, data mining, information trading and other means. Wikipedia
Data Stewards - this label describes accountability and responsibility for data and processes to control the use of data assets. There are varying types of Stewards:
Enterprise data stewards- oversite of the data domain across business functions
Business data stewards - those who are subject matter experts
Technical data stewards - database administrators, BI specialists , data quality administrators
It is necessary the every data set has a data owner. A person responsible for the decision regarding the data. They normal are a business data steward.
Then often there is a data governance steering committee to manage the progress and invoke innovation.