Abstract Opinion leaders play an important role in in?uencing people’s beliefs, actions and behaviors. Although a number of methods have been proposed for identifying in?uentials using secondary sources of information, the use of primary sources, such as surveys, is still favored in many domains. In this work we present a new surveying method which combines secondary data with partial knowledge from primary sources to guide the information gathering process. We apply our proposed active surveying method to the problem of identifying key opinion leaders in the medical ?eld, and show how we are able to accurately identify the opinion leaders while minimizing the amount of primary data required, which results in signi?cant cost reduction in data acquisition without sacri?cing its integrity.