Hakeem Muata Oluseyi[1] (born James Edward Plummer Jr.;[2] March 13, 1967)[3][4] is an American astrophysicist, cosmologist, inventor, educator, science communicator, author, actor, veteran, and humanitarian.

He lived in some of the country's toughest neighborhoods including the 9th Ward of New Orleans; Watts, Los Angeles, California; Inglewood, California; South Park, Houston, Texas; and Third Ward, Houston, Texas before settling in rural Mississippi a month before Oluseyi turned 13 years old.

[1] After leaving the Navy with an honorable discharge due to a skin condition from which he had suffered since he was a child, Oluseyi enrolled in Tougaloo College where he earned Bachelor of Science degrees in physics and mathematics.

[1] Oluseyi considered dropping out of Stanford due to the culture shock he experienced coming from Mississippi, where he had attended an all-black high school followed by an HBCU.

Compared with his previous schooling, where "everybody's in the same economic position," Oluseyi recalled that at Stanford, "how you dressed, how you talked, all these sort of things mattered.

Oluseyi eventually found a mentor in solar physicist Arthur B. C. Walker Jr., who helped him adjust to the environment, and completed his schooling at Stanford.

Under Walker's tutelage, Oluseyi helped to design, build, calibrate, and launch the Multi-Spectral Solar Telescope Array (MSSTA), which pioneered normal incidence extreme ultraviolet and soft x-ray imaging of the Sun's transition region and corona.

From 2001 to 2004 he was a research fellow at Lawrence Berkeley National Laboratory, working on the Dark Energy Camera and Vera C. Rubin Observatory.

[citation needed] Oluseyi appeared in the ABC special Truth and Lies: Hubris on the High Seas, which examined the Titan submersible implosion.