I love cheetsheets. Here's another one from Analytics Vidhya.
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References from LinkedIn
"I’ve worked with John together at Tapjoy, He is very passionate about solving data analytical problems. John already demonstrated in-depth experiences and skills on multiple aspects of data analytic fields and still eager to pick-up new technical skills when he needs to apply for real-world problem. I enjoyed the time we’ve together to execute data analytic projects." http://johnhoughton.net/wp-admin/widgets.php#remove
Johan Chin, VP Data Science, Tapjoy
"During the course of our time together at Tapjoy, John repeatedly demonstrated his strong analytical mindset and aptitude for picking up new skills and knowledge. In addition, John always exuded a passion for his work, which was evident through his enthusiasm to jump into complicated data sets, dig for insights, and share his findings with the team. I very much enjoyed working with John, and I would highly recommend him as a strong addition to any analytics team"
Ken Simonds, Product Quality Analyst, Facebook