His most significant discovery was Madonna, whom he signed to Sire Records in 1982.

Source: https://ksusentinel.com/2023/04/03/seymour-stein-the-legendary-music-executive-who-discovered-madonna-dies-at-the-age-of-80/

Like Tegan and Sara, they're on Sire with us as well.

Source: https://www.forbes.com/sites/stevebaltin/2023/11/05/best-of-2023-the-veronicas-make-a-perfect-comeback/

Seymour Stein, the brash, prescient, and highly successful founder of Sire Records who helped launched the careers of Madonna, Talking Heads, and many others, died Sunday at age 80, the reports.

Source: https://www.newser.com/story/333488/record-exec-who-discovered-madonna-dead-at-80.html

Sire Castrello Raymond, their second child, was born on September 29, 2021.

Source: https://thecurrent-online.com/celebrity/jenn-goicoechea/58422/