|Jeff Sackmann is an author and entrepreneur who has worked in the fields of sports statistics and test preparation.
In 2007, he co-founded (with Kent Bonham) College Splits, which aggregates amateur baseball data for MLB clubs and NCAA programs.
From 2006 to 2010, he ran Minor League Splits. He once wrote a weekly column for ESPN Insider during the college baseball season, has contributed to The Wall Street Journal, Baseball Prospectus, and appeared on NPR's Morning Edition.
Jeff has written several GMAT textbooks: Total GMAT Math [PDF | print], Total GMAT Verbal [PDF | print], GMAT 111 [PDF | Kindle | print], and a set of 1,800 practice GMAT math problems [PDFs]. Jeff has worked with several major GMAT-prep companies to develop and improve their student resources.
Jeff also dabbles in tennis analytics. He has created Tennis Abstract, publishes tennis research at Heavy Topspin, co-founded (with Ben Rothenberg) the fantasy tennis game Racket Rally, and has contributed to Tennis Magazine, The Wall Street Journal, and ESPN.com.
Until he learned that landlords expect rent payments, Jeff was a professional saxophonist and bandleader. He performed with a variety of groups, including his own Oy Christina! jazz orchestra and James Brown's original "funky drummer," Clyde Stubblefield.
From September 2011 to June 2013, Jeff was a full-time traveler, visiting 60 countries and all seven continents. He promises not to write a book about it.