Partnering with the computational science community is an essential strategy for carrying out the Argonne Leadership Computing Facility (ALCF) mission. Our users tackle complex science and engineering simulations that often benefit from interactions with our staff on a variety of issues. The topics range from detailed information about our leadership computing systems to algorithms that scale well on our systems, data mappings that are efficient for the application and the computer architecture, how to display the results of the simulations, and sometimes even how best to model the phenomena being investigated