[2] Johnson's research interests include the ultrafast photophysics and nonlinear optical properties of bulk, nanostructured, and quantum well semiconductor structures, ultrashort pulse propagation in fibers and high-speed lightwave systems.

Ultrashort pulses of light have been used to address technical and logistical challenges in medicine, telecommunications, homeland security, and have many other applications that enhance contemporary life.

Prior to being recruited for his position as director of UMBC's newest center, CASPR, in 2003, Johnson was the chairperson and distinguished professor of applied physics at the New Jersey Institute of Technology from 1995 to 2003.

[4] A significant part of Johnson's professional activities is dedicated to advancing the science careers of minorities and women both in the United States and developing countries.

In 2020, Johnson joined the Optica Diversity, Equity & Inclusion Rapid Action Committee that charged with developing recommendations for our corporate and program divisions to support and increase black scientists and engineers within the optics and photonics community.

One example of these efforts is reflected in his being the principal investigator of the $1.7 million NSF Informal Science Education Grant entitled 'Hands-On Optics: Making an Impact with Light.'

[8] In his state of the art laser lab at CASPR he has hosted Girl Scouts, local elementary school students, Meyerhoff[9] scholars, and politicians alike.

[4] Some examples of these include: Johnson's mother was a buyer for a major department store, and his father worked for the New York City Transit Authority as a bus driver.