Research Interests Scientific data & workflow engineering; data integration, knowledge representation & reasoning; conceptual foundations; data science tools. Current research topics include: • Modeling, design, and analysis of scientific workflows. • Optimization of data-intensive and compute-intensive workflows. • Conceptual foundations of provenance in databases and workflows. • Optimization of provenance capture and querying. • Principles and practice of data curation. • Provenance and reproducibility. • Knowledge-based data integration, knowledge representation and reasoning. • Reasoning about taxonomies and biodiversity informatics applications