This year's NEURON Summer Course has two components that can be taken individually or together. NEURON Fundamentals, which runs from June 20-23, presents what you need to know to use NEURON to model individual neurons and networks of neurons, and introduces parallel simulation. Parallel Simulation with NEURON, which runs from June 24-26, is for users who already know how to write hoc or Python code for NEURON, and need to create models that will run on parallel hardware. Strategies for debugging, and measuring and improving performance, receive special attention. Because of its advanced nature, each day of "Parallel Simulation" includes a block of time in which participants can work on their own projects with expert help close at hand. Registration is limited, and the registration deadline is Friday, May 29, 2015. Discounts are available for applicants who sign up for both courses and/or register by April 20, 2015. For more information see http://www.neuron.yale.edu/neuron/static/courses/nscsd2015/nscsd2015.html --Ted