Justin Lewis was hired as the Islanders assistant coach in July, 2019.

Prior to his time on the Island, Lewis served as the assistant coach at Texas A&M-Kingsville. In 2019, Lewis was an assistant for the best season in program history. The Javelinas set school records for wins in a season (52), win percentage (.839) and longest win streak (19). They compiled a record of 14-4 against ranked teams, including a sweep of No. 2 A&M-Commerce in March. TAMUK won the LSC Championship in the regular season and the LSC Tournament Championship in the same season for the first time ever before also capturing the South Central Regional Title and earned TAMUK's first ever trip to the College World Series, where they won four games before finishing as the National Runner-Up. For their efforts, the Javelina staff earned the title of South Central Regional Coaching Staff of the Year according to the National Fastpitch Coaches Association.

Lewis was the hitting coach and in 2019 the Javelinas re-wrote the record books. Lewis worked with a Javelina offense that set new program marks for runs scored in a season (343), total bases (768), on-base percentage (.387), and Home runs (46). Catcher Roxy Chapa broke her own single season home run record with 14. Anastasia Leibas broke the single season RBI record with 59. Lewis also worked with the infielders. In 2019 they tied the single season fielding percentage record at (.967)

The 2019 Javelinas placed eight student-athletes on the All-LSC roster, including a program-best five on the first-team. Pitcher Saidi Castillo became the first TAMUK softball player honored as LSC Freshman of the Year and would later garner a spot on the NFCA All-South Central Region First-Team. Breanna Smith and Anastasia Leibas also earned all-region nods.

In his first year in the Blue and Gold, Lewis' Javelinas ran up their highest win total since 2009, crafting a record of 29-26. TAMUK's regular season included a series victory over then No. 11 West Texas A&M where the Javs swept a Saturday doubleheader against the Lady Buffs. The sweep marked the first time since 2005 the Javelinas took both ends of a twin bill from a ranked squad. The team also reached the Lone Star Conference Tournament for the first time since 2009 and six of Lewis' student-athletes were recognized by the conference at the end of the regular season. Outfielder Loren Kelly and catcher Roxy Chapa garnered spots on the All-LSC second-team, while pitcher Sarah Gilbert, third baseman Rachael Longoria and first baseman/designated player Anastasia Leibas were chosen for the third-team. Longoria and outfielder Haley Boyett earned Golden Glove awards. As the hitting coach Lewis’ Javelinas broke the single season home run record (40) and catcher Roxy Chapa broke the single season home run record with (13). On defense, Lewis worked with a team the set a new single season mark in fielding percentage (.967).

He came to Kingsville from Tucson, Arizona where he spent the last nine years as a firefighter and a private instructor. Lewis was also a camp coach for University of Arizona head softball coach Mike Candrea for the three years before coming to TAMUK. His college coaching experience also includes three baseball seasons at Central Arizona College.

Lewis brings with him leadership experience and in fact wrote a leadership book for firefighters called Firefighter Self Rescue: The Evolution of Service. He also founded a nonprofit organization in the autism community called Firefighters vs Autism. The nonprofit raised money for rescue swim lessons for kids on the autism spectrum, pool fences for autism families, and provided autism awareness trainings for first responders.

As a student-athlete, Justin played two years at Central Arizona College and then transferred to University of Louisiana-Monroe, where he was an All-Conference performer.

He was born and raised in Tucson, Ariz. and is married to Amy. They have two children, Jack and Lucy.