How A.I. Helped One Man (and His Brother) Build a $1.8 Billion Company

Matthew Gallagher took just two months, $20,000 and more than a dozen artificial intelligence tools to get his start-up off the ground. From his house in Los Angeles, Mr. Gallagher, 41, used A.I. to write the code for the software that powers his company, produce the website copy, generate the images and videos for ads and handle customer service. He created A.I. systems to analyze his business’s performance. And he outsourced the other stuff he couldn’t do himself. His start-up, Medvi, a telehealth provider of GLP-1 weight-loss drugs, got 300 customers in its first month. In its second month, it...