" Standing next to him is Dr. Petranek, nonbinary, in hir mid-thirties with the broad cheekbones of Eastern European heritage and curly brown hair. Ze, too, is tall and confident, standing with hir thumbs hooked into hir belt loops and laughing heartily at something Banks has said. Dr. Petranek is one of the best Noropean engineers of hir generation and the designer of several systems used to keep us alive here, I recall from the show. Secondary specializations in synthetic biology and human biology. "

― Emma Newman , Before Mars (Planetfall, #3)