The SIMAC workshop on “Numerical Algorithm for Extreme Computing Architectures” will be held at Boston University on November 4th and 5th. It will focus on the design of Numerical Algorithms and Software Frameworks to accommodate the increasingly complex environment of multiscale physics and complex heterogeneous HPC architectures. Algorithmic examples include Multigrid (MG), Domain Decomposition (DD)solvers and Adaptive Mesh Refinement (AMR). Hardware examples include GPU and PHI heterogeneous architectures. The goal is to explore existing collaborative teams and frameworks that seek to respond to this disruptive technological landscape and suggest new or improved methods required to keep pace with the evolution of Extreme scale computing.