It is hard to release a textbook in 2023 without mentioning the global pandemic. We began the process of revising this book in early March of 2020 and our contributors worked on their chapters during one of the most challenging times for health care workers we hope to ever face. Regardless of the wave of the pandemic, we tried to continue providing high-quality maternity care and to work on sharing this knowledge with you. Once again, we are proud that this book represents a tremendous collaboration between obstetricians, pediatricians, internists, and anesthesiologists at The Ottawa Hospital. New chapters on medical education and quality assurance complement the previous content that has all been refreshed for this edition. We hope that Harry Oxorn would continue to be proud.