Orest Danylewycz is an information security engineer at Westfield who hosts the Dev Odyssey podcast. He introduces Postman Visualizer, a tool that visualizes API responses, and provides examples of how he has used it to visualize stock market data using MarketStack and Chart.js, for testing with JSONPath and XML filtering, and to build web apps by scraping websites with cheerio.js and Bootstrap. He also promotes additional resources for learning about Postman Visualizer through the Postman Learning Center, blog posts, and his YouTube channel.