C.T., M.R., S.J., E.J.S., J.J., T.A., A.C.M., M.M.X.T., H.I., and H.R.M. are members of the GP2 Cohort Integration Working Group (CIWG), of which H.R.M. is the lead, and M.M.X.T. and H.I. are co-leads. C.T. was the primary contributor in the drafting of this manuscript, assisted by M.R. and J.J. The draft was reviewed by all CIWG members prior to circulation to other contributing authors for review. M.B.M. is the co-lead of the GP2 Data and Code Dissemination Working Group and drafted the data availability section of this manuscript, together with B.C. who is senior associate director at the Michael J. Fox Foundation’s research division. D.V., K.L., H.L., and M.A.N. are members of the GP2 Complex Disease Data Analysis Working Group (DAWG), of which M.A.N. is the lead and H.L. is a co-lead. DAWG are responsible for the data cleaning and analysis described in this manuscript. DGH directs the Genomic Technologies Group within the Laboratory of Neurogenetics at NIH, which conducts the majority of sample genotyping for the Complex Network. C.E.W. and J.S. are members of the GP2 Operations and Compliance Working Group of which J.S. is a co-lead. C.B.P. and L.A.S. are scientific program managers for the GP2 Complex Disease Network. A.B.S. is the lead of the GP2 Complex Disease Network and C.B. is the co-lead. All listed authors reviewed the manuscript and provided comments and revisions prior to submission.