Abstract: Systems and methods for analyzing and representing human gait using motion sensor data may include collecting raw motion sensor data from a mobile device held on or near the user's sternum. The mobile device (or another device) may be configured to generate an information structure representation based on the raw motion sensor data, determine a gait cycle based on the information structure representation, identify gait events in the gait cycle, extract gait biomarkers based on the identified gait events, and determine a diagnosis based on the extracted biomarkers.