HuManagement works with global and regional celebrities and influencers like Christiano Ronaldo, Georgina Rodriguez, Megan Fox, Eva Longoria, Naomi Campbell, Huda Kattan, Neymar, Khabane Lame (Khaby), Nora Fatehi, Elissa, Maya Diab, Yasmine Sabri, Nour Ghandour, Dalia Mubarak, Salma Abu Deif, and Nancy Ajram, among others. In 2023, Warner Music Group announced a strategic investment in the company. HuManagement contributes to events like the Esports World Cup in Riyadh, Riyadh Season activations, the Red Sea Film Festival, Abu Dhabi and Dubai tourism activations, such as Formula 1 and NBA in Abu Dhabi. Before HuManagement, Hajjar spent nearly 15 years as chief marketing officer at Rotana Audio Visual.