Bart van den Hurk and an anonymous reviewer made many helpful comments during the review process. Many people have contributed to the evolution and success of GSWP since its inception in the early 1990s. I would like to acknowledge several individuals who played crucial roles. First and foremost I thank Piers Sellers, with whom it all started within ISLSCP. Nobuo Sato and Han Dolman were seasoned mentors to me as a greenhorn recent Ph.D. in whose lap this international project landed. Thanks to the GEWEX IGPO in the persons of Rick Lawford, Paul Try, Sam Benedict, and through it all Dawn Ehrlich. Pavel Kabat provided much support from the IGBP side, and later as head of ISLSCP after Piers Sellers left to follow his aspirations. Taikan Oki became my copilot as GSWP-1 advanced into GSWP-2. Aaron Boone, GSWP-1 participant and leader of the Rhône-AGG experiment, has always been a strong supporter. Jared Entin wrote his Ph.D. thesis on soil moisture analysis and GSWP-1, and later as a program manager at NASA helped to support GSWP-2. Among many of my colleagues at COLA, Xiang Gao was invaluable for bringing GSWP-2 to fruition and making the MMA such a good product. Others who made substantial contributions to GSWP while at COLA include Fanrong Zeng, C. Adam Schlosser, Mei Zhao, Zhichang Guo, and Jianfeng Wei. Jan Polcher, as first chair of GLASS, gave GSWP an organizational and scientific home, and the GLASS Panel has been supportive and encouraging throughout. Finally, thanks to J. Shukla and Jim Kinter for being always supportive of GSWP and providing any COLA resources the project needed.
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