Scott Soussa, a senior managing director and co-head of Blackstone Group's general partnership stakes business, is leaving the firm, spokeswoman Paula Chirhart confirmed in an email.
Mr. Soussa is leaving for another opportunity but has agreed to stay through year-end, Ms. Chirhart said.
Mustafa M. Siddiqui, also a senior managing director, who was co-head of the GP stakes business known as Blackstone Strategic Capital Holdings, will become sole head of the group. Blackstone's strategic capital group is part of its alternative assets management business, which is called BAAM. BAAM has $79 billion in assets under management.
At the same time, Michael Nash, also a senior managing director, is taking on the new position of chairman of the Strategic Capital Holdings. Mr. Nash will retain his role as chairman of Blackstone Real Estate Debt Strategies and executive chairman of Blackstone Mortgage Trust, a real estate investment trust.
These are not the only recent staffing changes at BAAM. In March, Scott Bommer joined as CIO of Blackstone Horizon, another unit of BAAM and in January, Joseph Dowling, former chairman of Brown University's investment office, joined as global co-head of BAAM.
"BAAM has been successfully expanding its platform by adding new talent and products to increase the diversity of offerings for investors," Ms. Chirhart said.