At 37, San Antonio mayor Julian Castro already has a decade of political office under his belt. And now he is getting the Democratic Party’s national spotlight as the keynote speaker at the convention in Charlotte. Meanwhile, his twin brother Joaquin is running for Congress. Hernán Rozemberg of the Fronteras desk brings us this profile.

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Hernán Rozemberg is award-winning journalist with more than 16 years of experience. He has worked for various newspapers, including The Arizona Republic and the San Antonio Express-News. For more than a decade, he has specialized in coverage of immigration and border issues, including at his current position as Senior Correspondent and Bureau Chief for a Southwest public media project, Fronteras: The Changing America Desk.  He holds at Master’s in International Relations from St. Mary’s University in San Antonio, Texas.