1. A method of converting pluripotent cells into induced neuronal cells, the method comprising: contacting a population of pluripotent cells with an effective dose of a neuron reprogramming (NR) system comprising one or more neuron reprogramming (NR) factors, wherein the NR factors are selected from the group consisting of: an Ascl agent, a Ngn agent, and a NeuroD agent for a period of time sufficient to reprogram said pluripotent cells, wherein a population of induced neuronal cells is produced.