Justin Baker Ries is an American marine scientist, best known for his contributions to ocean acidification, carbon sequestration, and biomineralization research.

from Franklin and Marshall College and a Ph.D. from the Johns Hopkins University for a dissertation 'Experiments on the effect of secular variation in seawater Mg/Ca (calcite and aragonite seas) on calcareous biomineralization'.

[1][2][3][4][5][6][7][8][9] Ries also discovered that ocean acidification can alter the shell mineralogy,[10] shell structure,[11] predator-prey dynamics,[12][13][9][14] and calcifying fluid pH of marine organisms, and produced the first geochemical model of the calcifying fluid that could predict organisms' responses to future ocean acidification.

[15][16] Ries and colleagues are also credited with discovering that the current rate of CO2-induced ocean acidification is the fastest in Earth history[17][18][19] and that many species of marine calcifiers today inhabit seawater that is already undersaturated with respect to their shell mineral.

[20][21] Ries holds carbon sequestration patents describing biologically and geologically inspired methods for removing and mineralizing CO2 from the flue-streams of fossil-fuel-fired power plants and transoceanic vessels, production of carbon-negative cement, and alleviating bottlenecks in the global carbon cycle.