Blackline Midstream, LLC (“Blackline”) today announced the appointment of Guillermo Sierra as Executive Vice President and Head of Corporate Strategy.   Mr. Sierra will be based in Blackline’s Houston office and will report directly to the CEO.

Mr. Sierra joins Blackline from Macquarie Capital (“Macquarie”), where he was Managing Director and Head of North America Midstream Advisory. Throughout his career as an investment banker, Mr. Sierra has advised on a number of bellwether transactions in the energy infrastructure sector with a combined approximately $200 billion of transaction experience across more than 50 transactions over 14 years at Macquarie, Credit Suisse, Evercore Partners and before that, Lehman Brothers.  

In addition to his investment banking roles, Mr. Sierra also served as Chief Strategy Officer and Head of M&A for US Development Group and it’s affiliated MLP, NYSE: USDP.

James M. “Mike” Day, CEO of Blackline, commented “We are very excited to have Guillermo join our team at Blackline. His extensive M&A transaction experience and broad industry relationships across the energy sector combined with his proven entrepreneurial skills will accelerate Blackline’s achievement of its growth vision by organically growing our current businesses and expanding into new ventures in the energy infrastructure and logistics space.”

Mr. Sierra received his Bachelor of Science and graduated With Honors from The Wharton School of The University of Pennsylvania.

About Blackline Midstream

Blackline Midstream is a growth oriented midstream company formed to develop and acquire midstream oil & gas and related assets. Blackline’s core values include an intensive focus on the safety, reliability, environmental stewardship and regulatory compliance of its operations and a positive contribution to the communities in which it operates. The management team at Blackline has extensive experience developing and operating large scale transportation and logistics assets for oil & gas customers across North America. Prior experience includes long term careers with Shell Oil and the BNSF Railway and the successful completion of over a dozen major ground up terminal developments during their decade long involvement with US Development Group. Blackline Midstream is headquartered in The Woodlands, TX.


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Bill Swan
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