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The Source
Monday-Thursday from noon-1 p.m. on KSTX
Hosted by David Martin Davies

The Source is a daily, one-hour call-in talk program that gives listeners in San Antonio the opportunity to call and connect with our in-studio guests and city-wide audience.

The Source seeks to give life, context and breadth to the events and issues affecting San Antonio by bringing newsmakers and experts to the public, and highlighting the people being affected by the news of the day.

The show is hosted by veteran journalist David Martin Davies.

Tune in to The Source for insightful discussion and analysis on topics that matter to residents of the Alamo City.

Contribute to the conversation:

  • Call or text during the live show at 833-877-8255.
  • Leave a voicemail at 210 615-8982 anytime. Submissions may be played on-air.
  • Email comments to thesource@tpr.org.
Ways To Subscribe
Stay Connected
Support for The Source comes from Texas Mutual Workers' Compensation Insurance.
Support for The Source comes from UT Health San Antonio.
Latest Episodes
  • A petrochemical site in Corpus Christi. The state is opening up land along the Gulf coast to drill wells that could store carbon dioxide from industrial pollution.
    How Trump's EPA rollback impacts Texas
    As the U.S. Environmental Protection Agency under President Donald Trump moves to unwind or delay a range of air- and climate-related rules, public-health and environmental advocates warn the shift could hit Texas especially hard.
  • The $10 million Commerce Street construction project began in August 2020 and is expected to be completed in March 2023.
    New public works director on SA road construction
    Art Reinhardt is the director of the San Antonio Public Works Department. He'll discuss large-scale construction projects that will improve streets, drainage, parks and facilities.
  • 'People Get Ready': Protest Songs
    New generations of Americans are taking to the street in protest, demanding change and accountability. And they are discovering what protestors of the 1960s and '70s found out— protesting is hard, frustrating and requires sacrifice. But protest songs can help. Songs demanding freedom and justice go back generations and are also being composed today. We hear from Stephen Stacks about his new book The Resounding Revolution: Freedom Song After 1968.
  • What we owe to the 1963 protesters for civil rights
    On Juneteenth we look back at the fight for civil rights in America. Historian Peniel E. Joseph discusses his new book Freedom Season: How 1963 Transformed America’s Civil Rights Revolution." He reflects on the power of protest and community organizing and how segregationists and other bigots in power were pushed out of the way. And what this means today.
  • The rise of independent voters cuts them out of the primary process
    The rise of the independent voter
    There’s growing evidence of a great political shift in America. A record-high 45% of U.S. adults identified as political independents in 2025. Meanwhile an equal share of U.S. adults — 27% each — identified as either Democrats or Republicans. But this means a large share of voters are unrepresented in our two-party political system. As independents rise, how will they have a voice?
  • Planned Parenthood South Texas post Dobbs
    Since the overturning of Roe v. Wade — and the outlawing of abortion in Texas — Planned Parenthood in San Antonio has continued. Planned Parenthood South Texas continues to provide services — but not abortions. And Planned Parenthood in San Antonio is painting rainbow crosswalks at its health centers.
  • The magic and meaning of metamorphosis
    We’ve all marveled at the transformation of the caterpillar into the butterfly. We think of it as a singular mystery of nature, but nearly three-quarters of all animal species undergo some form of metamorphosis. In Oren Harman’s new book, "Metamorphosis: a Natural and Human History," he explores the scientific, philosophical, and artistic aspects of transformation. How does it fit with the questions about individuality, struggle, and the life cycle?
  • The 2026 food pyramid promoted by the USDA.
    Why the new upside-down food pyramid is hard to swallow
    The 2026 U.S. Dietary Guidelines introduced an up-side down food pyramid that prioritizes meat, fats, and full-fat dairy. How healthy is this new food framework? We’re joined by Dr. Nate Wood, head of culinary medicine at the Yale School of Medicine and a former chef to talk about avoiding processed foods and eating healthy.
  • Tapping into the power of the protest
    In recent months the United States has witnessed a resurgence of protesters taking to the streets calling for change on social, political and environmental issues. These marchers are walking in the footsteps of other protesters who fought for civil rights, labor and peace. What makes a protest successful? How can a mass demonstration lead to substantial and long-lasting change. We discuss "A Protest History of the United States" by Gloria J. Browne-Marshall.
  • Greenland
    Trump, Greenland and international law
    As President Donald Trump renews calls for the United States to “claim” Greenland, international law is emerging as the central constraint. It’s clear under international law and the UN treaty that military force and global intimidation cannot be used to change borders in the modern era.