Students at a New Jersey prep school were treated in May to a question-and-answer session with Jack Dorsey, the co-founder of short-messaging service Twitter Inc. and of mobile-payments company Square Inc. In the session with students at the Pingry School, the 35-year-old Mr. Dorsey discussed how he splits his time between two fast-growing start-ups, his […]

Students at a New Jersey prep school were treated in May to a question-and-answer session with Jack Dorsey, the co-founder of short-messaging service Twitter Inc. and of mobile-payments company Square Inc.

In the session with students at the Pingry School, the 35-year-old Mr. Dorsey discussed how he splits his time between two fast-growing start-ups, his childhood fascination with maps and dispatch technology, and how he knew he was onto something with Twitter.

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