Joseph Sowin was promoted to co-chief investment officer of alternative credit manager Highland Capital Management, company spokeswoman Lucy Bannon confirmed in an email.
He replaces Trey Parker, who moved to running the private equity team full time earlier this year.
Mr. Sowin, together with Highland Capital co-founder and fellow co-CIO Mark Okada, is responsible for overseeing the firm's $10 billion in assets under management.
Mr. Sowin was head of global equity trading and will continue to manage the firm's trading operations, in addition to being co-CIO.