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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.
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Support for The Source comes from Texas Mutual Workers' Compensation Insurance.
Support for The Source comes from UT Health San Antonio.
Latest Episodes
  • The Red Scare still scares today
    It was a time when Americans were afraid to speak out. A swirling political and cultural hysteria was part of life. Anyone who questioned American policy was targeted and ruined. Books were taken from libraries. School teachers were being scrutinized. It was the Red Scare. In post-World War II America being called a communist was a serious charge. America was willing to abandon freedoms because of alleged conspiracies. Clay Risen joins us to discuss his new book "Red Scare: Blacklists, McCarthyism, and the Making of Modern America."
  • Investigating Houston's Candy Man serial killer
    In Houston, from 1970 to 1973, Dean Arnold Corll raped, tortured and murdered a minimum of twenty-eight teenage boys. He was known as the Candy Man. The full story has never been told until now. Investigative reporter Lise Olsen has uncovered new information about the killer and his victims. Her new book is The Scientist and the Serial Killer: The Search for Houston’s Lost Boys.
  • 'To bind up the nation’s wounds': How peace came to the Civil War
    We think of the surrender of Robert E. Lee as the end of the Civil War, but the end really wasn’t clear at the time. The Galveston News reported Lee’s surrender as a positive development for the Confederacy and encouraged Texans to fight on. How did Lincoln’s peace take hold? How did a divided nation come together? Michael Vorenberg’s new book is Lincoln’s Peace: The Struggle to End the American Civil War.
  • The book on saving the Amazon that murder couldn't silence
    The Amazon rainforest is known as the “lungs of planet Earth,” but what happens when deforestation in Brazil continues? One journalist tried to alert the world to this coming crisis. Dom Phillips was writing the book “How to Save The Amazon” when he was murdered. His colleagues refused to let Phillips' work die—and they completed his book.
  • Who loses in the gerrymandering war?
    After President Trump ordered Texas to immediately redistrict its congressional map to deliver five additional Republican congressional seats, California Democrats responded with their own redistricting scheme. How does gerrymandering work? Why is this allowed? What does this mean for a viable democracy?
  • How public policy is driving up electric bills
    Electricity costs have risen 5.5% in the past year, nearly double the national inflation rate. And they are projected to continue to climb. According to a new study, one driver of higher power bills is how the public is subsidizing the energy bills of some of the largest Tech companies in the world. Meanwhile cheap renewable energy (like solar and wind) is being outlawed by the Trump administration.
  • "A Trip to Mars" (1910) is a significant early science fiction film Produced by Thomas Edison, A "A Trip to Mars," revolves around a group of scientists who build a spacecraft capable of traveling to Mars., where they encounter alien civilizations and strange landscapes.
    When Mars mania grabbed America
    The race is on to get humans to Mars. But what will they find? Not little green men, despite that’s what many believed about the red planet. In the early 1900s it was thought that Mars was inhabited and was home to a utopian society in the grip of a planet-wide drought. How did Mars mania grip the nation, influence pop culture and give us cause to stare into the night sky and wonder?
  • DUI's deadly toll: Texas law enforcement steps up for Labor Day
    Last summer, 273 people were killed, and 596 were seriously injured in DUI-alcohol related crashes in Texas. And there were 327 DUI-alcohol related traffic crashes over Labor Day weekend in Texas in 2024, causing 10 deaths and 36 serious injuries. Texas law enforcement agencies this week are launching “Drive Sober, No Regrets,” a campaign to keep drivers from getting behind the wheel while under the influence of alcohol.
  • San Antonio Mayor Gina Ortiz Jones in the TPR Source Studio - Aug 18 2025
    Mayor Jones on city vote for Spurs arena
    San Antonio Mayor Gina Ortiz Jones joins "The Source" to discuss whether the city should have its own referendum to commit public funds to Project Marvel, a proposed downtown development that would include a new home for the San Antonio Spurs.
  • Texas bans students' phones
    As a new academic year begins for Texas schools, one major change is coming: House Bill 1481, which takes effect this fall. It aims to create phone-free classrooms across the state. The legislation is designed to protect students from digital distractions and online harm. Maurine Molak of David’s Legacy Foundation has been a driving force behind the new law.