He or she would probably enjoy applied mathematics. They could work at a public health establishment as a biostatistician, for example, preventing the spread of illness; or controlling quality in pharmaceutical manufacturing; or designing infrastructure like highways to avoid congestion... Mathematics has applications everywhere.
My advice would be to stay in academia -- with a PhD and 4 years of experience they are overqualified -- but search out inter-disciplinary programs, especially in computing. Collaborating with computer scientists (or becoming one) is a sure bet.
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He or she would probably enjoy applied mathematics. They could work at a public health establishment as a biostatistician, for example, preventing the spread of illness; or controlling quality in pharmaceutical manufacturing; or designing infrastructure like highways to avoid congestion... Mathematics has applications everywhere.
My advice would be to stay in academia -- with a PhD and 4 years of experience they are overqualified -- but search out inter-disciplinary programs, especially in computing. Collaborating with computer scientists (or becoming one) is a sure bet.