We present the Hybrid Activation Multiple Access scheduling protocol (HAMA) for wireless ad hoc networks. Unlike previous channel access scheduling protocols that activate either nodes or links only, HAMA is a node-activation oriented channel access scheduling protocol that also maximizes the chance of link activations. According to HAMA, the only required information for scheduling channel access at each node is the identifiers of neighbors within two hops. Using this neighborhood information, multiple winners for channel access are elected in each contention context, such as a time slot in a frequency band or a spreading code. Except for time slot synchronization and neighbor updates on the two-hop neighborhood changes, HAMA dedicates the bandwidth completely to data communication. The delay and throughput characteristics of HAMA are analyzed, and its performance is compared with pure node activation based scheduling protocols by simulations.