Abstract: Embodiments of ad hoc data sharing systems and methods for ad hoc sharing of data are disclosed. In some embodiments, a data sharing system enables an individual to administer ad hoc, real-time or near real-time direct private sharing of mission critical information between authorized team members separated by time and space. This can enable real-time collaboration between all team members over a computer network, which can incorporate the redundancy of multiple real-time human evaluations by several team members to prevent miscommunication errors and facilitate quality assurance of mission critical data. An individual who serves as an administrator of the data sharing system does not need to have technical knowledge of computers, which may be particularly advantageous in case of sharing medical data by medical professionals.