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Mr. Strickland joined Vertex in 2007, serving in a variety of leadership and executive roles ranging from Manager of Supply to Chief Operations Officer, which he held from October 2015 to June 2022. Prior to joining Vertex, Mr. Strickland was employed by Texpar Energy L.L.C., first as General Manager from November 1999 to November 2003, and then as Project Manager from November 2003 to October 2007. From 1986 to 1999, he was the General Manager and Vice-President of Sellers Oil Inc., then one of the largest recycling and fuel marketers of used oil and #6-fuel oil in the southeast. Mr. Strickland has over 21 years of experience in management roles of developing companies in the recycling of used oils and the fuel blending business. In his various positions, he has developed used oil collection fleets, environment services (non-hazardous), terminal business of #6-oil from water ports and helped develop software for used oil collection fleets.