The following excerpt is from Mariani v. Colvin, No. 13-1941 (2nd Cir. 2014):
"'Once a disability claimant proves that his severe impairment prevents him from performing his past work [i.e., at step four], the [Commissioner] then has the burden of proving that the claimant still retains a residual functional capacity to perform alternative substantial gainful work which exists in the national economy.'" Rosa v. Callahan, 168 F.3d 72, 77 (2d Cir. 1999) (alteration in
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