This symposium will focus on advances in materials growth, device fabrication and understanding intrinsic charge carrier transport and optical properties of highly ordered organic semiconductors. The latter class of materials includes small-molecule organic molecular crystals, large grain-size polycrystalline organic films and highly ordered (liquid crystalline) conjugated polymers. Due to the reduced disorder, studies of these devices in recent years have resulted in immense progress in understanding of fundamental properties of organic semiconductors. Among the recent developments that will be presented are advances in materials synthesis, organic single-crystal growth, reduction of traps, device patterning, structure-property relationship studies, device physics, fundamentals of charge and exciton dynamics, characterization of bulk/interfacial properties at various length-scales.