Isaku Yamahata is an opensource developer, mainly on kernel/virtualization/networking/virtualized networking/cloud.
Specialties: Linux(file system/ext3/xfs, network stack, ALSA), virtualization(Xen, KVM, QEmu), openstack(mainly Neutron, networking-odl), SDN(OpenDaylight, Ryu), datapath(Open vSwitch), networking, openflow.