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R.J. Greenwalt has extensive work experience as a Chief Engineer in various companies. R.J. started their career as a Field Service Technician at Dowell Oilfield Services in 1994 and worked there until 1996. R.J. then worked as a Freelance Maritime Engineer from 1996 to 2000. After that, they joined Seabulk Tankers as a Chief Engineer from 2000 to 2005. R.J. then worked at American Cargo Transport as a Chief Engineer from 2005 to 2009. Following that, they worked at Seabulk Tankers again as a Chief Engineer from 2009 to 2010. R.J. then worked at American Maritime Officers as a Chief Engineer/Mechanic from 2010 to 2011. R.J. later worked at C-MAR / MMS as a Chief Engineer/Mechanic from 2011 to 2013. R.J. joined Gulf Drilling International as a Chief Engineer from 2014 to 2015. R.J.'smost recent position is Chief Engineer at Schuyler Line Navigation Company since 2015. R.J. also currently holds the position of Chief Engineer at MEBA Dist 1-PCD (AFL-CIO) starting from 2021.

R.J. Greenwalt attended the University of California, Santa Barbara from 1978 to 1979, where they studied Oceanography, Chemical and Physical. They did not obtain a degree during their time at this institution. Afterwards, R.J. Greenwalt pursued Advanced firefighting at Texas A&M University, but the specific dates of this education are unknown. Additionally, R.J. Greenwalt attended various schools for USCG license upgrades, although no specific dates or degree information are provided for this period of education.