LAKE SUCCESS, N.Y. – DealerTrack Holding Inc., a Web-based provider of sales and finance solutions for the U.S. automotive retail industry, acquired in separate transactions, substantially all of the assets of Automotive Lease Guide (ALG), LLC and North American Advanced Technology (NAT), Inc. Based in Santa Barbara, Calif., ALG has been providing residual vehicle values to the automotive industry for more than 35 years. Its guidebooks, data products and consulting services allow automotive industry participants such as dealerships, manufacturers and financing sources to estimate the approximate market value of a vehicle at the end of a lease. NAT, based in Rosemount, Ill, has been providing technology solutions for aftermarket providers, including insurance companies and automotive dealers, for more than 20 years. According to a DealerTrack release, John Blair will continue as CEO of ALG, and Mark Nagelvoort will continue as president of NAT.