Greg Meimers and Steve Biernbaum presented on collecting sensor data from mobile phones in real-time using JavaScript, REST services, Kafka, and Spark Streaming. The data would be classified using machine learning into categories like resting, walking, and running. It discussed how technologies like Kafka can store and process streaming data and how Spark is a fast engine for large-scale data processing. The goal was to analyze acceleration data from phone sensors to identify unique walking signatures for biometric identification.