With the increasing popularity of machine learning (ML), many open source software (OSS) contributors are attracted to developing and adopting ML approaches. Comprehensive understanding of ML contributors is crucial for successful ML OSS development and maintenance. Without such knowledge, there is a risk of inefficient resource allocation and hindered collaboration in ML OSS projects. Existing research focuses on understanding the difficulties and challenges perceived by ML contributors through user surveys. There is a lack of understanding of ML contributors based on their activities recorded in the software repositories. In this paper, we aim to understand ML contributors by identifying contributor profiles in ML libraries. We further study contributors’ OSS engagement from four aspects: workload composition, work preferences, technical importance, and ML-specific vs SE contributions. By investigating 11,949 contributors from 8 popular ML libraries (i.e., TensorFlow, PyTorch, scikit-learn, Keras, MXNet, Theano/Aesara, ONNX, and deeplearning4j), we categorize them into four contributor profiles: Core-Nighttime , Core-Daytime , Peripheral-Nighttime , and Peripheral-Daytime . We find that: 1) project experience, authored files, collaborations, pull requests comments received and approval ratio, and geographical location are significant features of all profiles; 2) contributors in Core profiles exhibit significantly different OSS engagement compared to Peripheral profiles; 3) contributors’ work preferences and workload compositions are significantly correlated with project popularity; and 4) long-term contributors evolve towards making fewer, constant, balanced and less technical contributions.