Key authors for IVP include John Stott, Don Carson, Amy Orr-Ewing and Emma Scrivener. Imaging (IVP, ultrasonography, CT scan) will identify the lesion. All IVP Board Members serve as volunteers. Existing investors GGV Capital, Greylock Partners, IVP, and Mercato Partners also participated. This is referred to as the IVP solution. In 1984 Linda Doll became director of IVP. In 1990, Ken DeRuiter became executive director of IVP. IVP invested in Twitter in February 2009, and in Fleetmatics and Marketo in 2010. Both were published by the publishing house with which he had a lifelong association, IVP. The first IVP fund had $22 million. SPCK merged with Inter-Varsity Press (IVP) in 2015. In 2015, GrowthCap named IVP #1 on their Top 25 Growth Equity Firms List. An IVP can be performed in either emergency or routine circumstances. The UCCF offices housed the IVP office staff for some 29 years. She authored, co-authored or edited thirteen books, including "The IVP Women's Bible Commentary".