Khalil joined Markaz in 1989 as president of Mar-Gulf Management, a subsidiary based in Los Angeles, and held senior management positions across its group of companies, including COO, before being appointed CEO in 2020. In 2023, Markaz reported total assets under management of $3.94 billion. It also recorded revenues of $85.5 million in 2023, a 40% increase compared to 2022 due to an increase in the sale of international and GCC real estate investments. In October 2023, Markaz extended its partnership with Gulf Bank, which serves as its selling agent for investment funds worldwide.