Maag was the CEO of STRATEC Medical. After a successful IPO in 1996, STRATEC merged, in 1999, with SYNTHES USA into SYNTHES-STRATEC. In 2000 Maag left SYNTHES-STRATEC. He has since assumed various Board of Directors mandates and is involved in private equity financed start-ups and spin-offs.
Swiss "Bilanz" magazine estimates his net worth at $1.35 billion.