Plains names Liollio to succeed Chandler as EVP, COO

Dean Liollio will take over as COO of Plains on Oct. 2.

Sept. 29, 2026

From left: Dean Liollio, Chris Chandler — Plains All American Pipeline LP and Plains GP Holdings have named Dean Liollio (left) to serve as EVP and COO, effective Oct. 2, He succeeds Chris Chandler (right), who is resigning to pursue other interests, the company said.

Plains All American Pipeline LP and Plains GP Holdings have appointed Dean Liollio to serve as executive vice-president and chief operating officer effective Oct. 2, 2026.

Liollio will succeed Chris Chandler, who is resigning from Plains to pursue other interests, the company said in a release Sept. 29. Chandler joined Plains in 2018 after previously serving in leadership roles at Phillips 66.

Liollio previously served as senior vice-president, special projects, prior to his appointment as executive vice-president and COO. Prior, the served as president of Plains Midstream Canada from 2020 until 2024, as president of PAA Natural Gas Storage from 2008 until 2020 and as president of Plains Gas Solutions from 2016 until 2020. Prior to joining Plains in 2008, Liollio held a number of executive roles including serving as president, ceief executive officer and director of EnergySouth Inc. and as president and COO of Centerpoint’s natural gas distribution operations across a five-state area.