When international friends compare career notes, great things can happen. Upon realising that women leaders face universal challenges, Izzana Salleh co-founded the nonprofit Girls for Girls International, a “global sisterhood” to provide women aged 16 to 25 with the skills, support and courage to become leaders. It has worked with 10,000 mentees and 1,500 mentors across 26 countries. Its aim: to train a million future leaders by 2025.