Deputy Crown Prince Mohammed bin Salman, center, posed with the chiefs of staff of the… RIYADH, Saudi Arabia—Before his father ascended to the throne last year, Mohammed bin Salman was an obscure prince and few outside the kingdom knew his name. Today, the 30-year-old has risen to a position of almost unrivaled power, emerging as the face of change in Saudi Arabia as it seeks to assert its regional leadership, overhaul its oil-dependent economy and recalibrate ties with the U.S. Prince Mohammed’s prominent role makes him one of the region’s most important figures. But there are also concerns among allies that Saudi Arabia’s more aggressive posture on issues including regional influence and oil policy could prove destabilizing. Prince Mohammed, as he has been for years, is likely to be at King Salman’s side on Wednesday when President Barack Obama meets the Saudi monarch in Riyadh. The president’s visit, his […]