He is the chief executive officer, president, and chairman of the board of Halliburton, an oil field service company with operations in over 70 countries.

Miller competed briefly in professional rodeo roping before attending Texas A&M University, where he received his Masters in Business Administration.

During his early years at Halliburton, Miller worked in oil field operations in Venezuela, Angola, Indonesia, and Dubai.

Miller was named president in 2014, CEO in 2017, and chairman of the Halliburton board on January 1, 2019.

[4] As the largest contributor to global fracking, the company faces ongoing criticism regarding its ecological impact.