Science With Purpose

Science, Humanity, and the Pursuit of Prevention: A Lifelong Journey in Environmental and Public Health

In this inspiring collection, Dr. William Au reflects on five decades of groundbreaking work at the intersection of environmental health, toxicology, molecular epidemiology, and public service. From his early research on gender determination in the American bald eagle to pioneering studies on DNA repair and transplacental carcinogenesis, Dr. Au's scientific journey exemplifies a lifelong commitment to protecting human health through innovation and collaboration.

Across the chapters, readers will discover the development of powerful biomonitoring tools, including the Challenge Assay, used to assess DNA damage and repair in populations exposed to toxins-from cigarette smokers and uranium miners to communities impacted by arsenic and industrial chemicals. These insights reveal the ethical and practical imperatives of precision prevention-the idea that understanding early biological responses can prevent disease before it begins.

Dr. Au also confronts some of the world's most pressing public health crises, including tobacco-related diseases, electronic waste pollution, and the multigenerational impact of nuclear testing. His work highlights how science, when guided by compassion and integrity, can inform policy, empower communities, and inspire global cooperation.

The book also chronicles his academic leadership at the University of Texas Medical Branch (UTMB), his instrumental role in establishing an English-language medical curriculum in China, and his efforts to advance toxicology education in Thailand and Romania. These experiences underscore Dr. Au's enduring belief that science is a form of diplomacy-a bridge across cultures and generations.

Deeply personal and profoundly scientific, this volume pays tribute to the mentors, students, and global partners who shaped a career dedicated to improving lives. It reminds readers that science is not merely about discovery-it is about service, humility, and human connection.

Key themes include:

• Environmental and occupational toxicology

• DNA repair, genomic biomarkers, and molecular epidemiology

• Public health prevention and policy impact

• Global collaboration in science and education

• Ethical responsibility in environmental research

Whether you are a researcher, clinician, policymaker, or student, Science, Humanity, and the Pursuit of Prevention offers a timeless message: that knowledge, compassion, and courage can change the world.