Weak Lensing in the Dark Energy Survey

We show tests of weak lensing on $\sim$200 sq. deg. of DES Science Verification data, with a focus on validation of galaxy-shear and mass mapping measurements. These tests include shear around stars and random points, tests of the PSF model, and cross-correlations with various sources of systematic errors. We show preliminary results for stacked galaxy lensing and wide-field mass maps. We conclude with new lensing measurements that we have carried out with SDSS and will apply to DES.