For more information, see Wellspring Philanthropic Fund (Nonprofit)
Wellspring Advisors is a for-profit limited liability corporation (LLC) created to manage Wellspring Philanthropic Fund, a major center-left funding nonprofit.  It’s been described by Philanthropy News Digest as a “consulting firm for anonymous donors.”  The company has also been described as a “private philanthropic advisory firm.” 
The firm was created in Delaware in May 2001; its closely associated private foundation, the Wellspring Philanthropic Fund, was incorporated in New Jersey in in 1999 (though the group considers its formation year 2001).  
Relationship with Wellspring Philanthropic Fund
According to its IRS filing for 2016, Wellspring Advisors: 
provides operational, programmatic, administrative and grantmaking support to the foundation [Wellspring Philanthropic Fund]. Wellspring [Advisors] administer’s the foundation’s grantmaking program and interfaces with the foundation’s donor-advised fund grantees . . . . Wellspring staff members develop the foundation’s grantmaking strategy and programs, research potential recipients of advised grants from the foundation’s donor-advised fund accounts[, and] monitor the usage of grants advised by the foundation through its donor-advised fund accounts and performance of such grantees. Wellspring also manages and supports capacity building, convenings and other similar activities to support the effectiveness of the donor-advised fund grantees.
Payments from Wellspring Philanthropic Fund
From 2001 to 2017, Wellspring Advisors received approximately $142 million in contractor fees from Wellspring Philanthropic Fund (a.k.a. Matan B’Seter Foundation).  In January 2018, Wellspring Advisors became an arm of the Wellspring Philanthropic Fund. 
|Payments to Wellspring Advisors|
John R. Taylor is the managing partner of Wellspring Advisors and founder of Wellspring Philanthropic Fund. Business profiles online suggest Taylor previously worked for Berger & Montague P.C. from 1989-1997 and as a litigator for Dechert LLP from 1986 to 1989. 
Board of Directors
According to filings with the District of Columbia, Wellspring Advisors is managed by four governors: Adam Barber, John Reid Taylor, William Myles Taylor, and Raymond Eng. 
For more information, see Wellspring Philanthropic Fund (Key Staff)
Employee profiles strongly suggest that Wellspring Philanthropic Fund, the foundation, shares staffers with its associated for-profit consulting firm, Wellspring Advisors. Wellspring Philanthropic Fund’s IRS filing for 2017 reports paying nothing ($0) in employee salaries, benefits, or other compensation.  As of August 2019, Wellspring Philanthropic Fund has approximately 68 staffers, advisers, and consultants.