A human is a complicated system. Various digital human models are used to describe human physical, biological, physiological, behavioral, mental, and cognitive features and characteristics and to simulate/predict human responses under various conditions, such as force, acceleration, heat, electro-magnetic waves, etc. Digital human models have been widely used in human-centered products and services. Innovision has more than 20 years of experience and broad capabilities in human modeling and simulation, from human shape modeling and musculoskeletal modeling to multi-rigid body modeling and full body anatomical structure finite element modeling. We are good at using a variety of open source software tools (e.g., Blender, Unity, OpenSim, Pulse Engine) and commercial-off-the-shelf tools (3dsMax, Motion Builder, and LSDYNA) to solve challenging problems of anthropometrics, ergonomics, biomechanics, and physiology.