Tony Fischetti is a data scientist at College Factual, where he gets to use R everyday to build personalized rankings and recommender systems. He graduated in cognitive science from Rensselaer Polytechnic Institute, and his thesis was strongly focused on using statistics to study visual short-term memory. Tony enjoys writing and contributing to open source software, blogging at onthelambda, writing about himself in third person, and sharing his knowledge using simple, approachable language and engaging examples. The more traditionally exciting of his daily activities include listening to records, playing the guitar and bass (poorly), weight training, and helping others.

Brett Lantz (DataSpelunking) has spent more than 10 years using innovative data methods to understand human behavior. A sociologist by training, Brett was first captivated by machine learning during research on a large database of teenagers' social network profiles. Brett is a DataCamp instructor and a frequent speaker at machine learning conferences and workshops around the world. He is known to geek out about data science applications for sports, autonomous vehicles, foreign language learning, and fashion, among many other subjects, and hopes to one day blog about these subjects at Data Spelunking, a website dedicated to sharing knowledge about the search for insight in data.

Jaynal Abedin currently holds the position of Statistician at the Centre for Communicable Diseases (CCD) at icddr,b ( www.icddrb.org). He attained his Bachelor's and Master's degrees in Statistics from the University of Rajshahi, Rajshahi, Bangladesh. He has vast experience in R programming and Stata and has efficient leadership qualities. He is currently leading a team of statisticians. He has hands-on experience in developing training material and facilitating training in R programming and Stata along with statistical aspects in public health research. His primary area of interest in research includes causal inference and machine learning. He is currently involved in several ongoing public health research projects and is a co-author of several work-in-progress manuscripts. In the useR! Conference 2013, he presented a poster—edeR: Email Data Extraction using R, available at http://www.edii.uclm.es/~useR-2013/abstracts/files/34_edeR_Email_Data_Extraction_using_R.pdf—and obtained the best application poster award. He is also involved in reviewing scientific manuscripts for the Journal of Applied Statistics (JAS) and the Journal of Health Population and Nutrition (JHPN). He is also a successful freelance statistician on online platforms and has an excellent reputation through his high-quality work, especially in R programming. He can be contacted at joystatru@gmail.com, http://bd.linkedin.com/in/jaynal; his Twitter handle is @jaynal83.

Hrishi V. Mittal has been working with R for a few years in different capacities. He was introduced to the exciting world of data analysis with R when he was working as a senior air quality scientist at King's College, London, where he used R extensively to analyze large amounts of air pollution and traffic data for London's Mayor's Air Quality Strategy. He has experience in various other programming languages but prefers R for data analysis and visualization. He is also actively involved in various R mailing lists, forums, and the development of some R packages.

Bater Makhabel (LinkedIn: BATERMJ and GitHub: BATERMJ) is a system architect who lives across Beijing, Shanghai, and Urumqi in China. He received his master's and bachelor's degrees in computer science and technology from Tsinghua University between the years 1995 and 2002. He has extensive experience in machine learning, data mining, natural language processing (NLP), distributed systems, embedded systems, the web, mobile, algorithms, and applied mathematics and statistics. He has worked for clients such as CA Technologies, META4ALL, and EDA (a subcompany of DFR). He also has experience in setting up start-ups in China._x000D_ Bater has been balancing a life of creativity between the edge of computer sciences and human cultures. For the past 12 years, he has gained experience in various culture creations by applying various cutting-edge computer technologies, one being a human-machine interface that is used to communicate with computer systems in the Kazakh language. He has previously collaborated with other writers in his fields too, but Learning Data Mining with R is his first official effort.

Edina Berlinger has a PhD in economics from the Corvinus University of Budapest. She is an associate professor, teaching corporate finance, investments, and financial risk management. She is the head of the Finance department of the university, and is also the chair of the finance subcommittee of the Hungarian Academy of Sciences. Her expertise covers loan systems, risk management, and more recently, network analysis. She has led several research projects in student loan design, liquidity management, heterogeneous agent models, and systemic risk.

Ferenc Ills has an MSc degree in mathematics from Etvs Lornd University. A few years after graduation, he started studying actuarial and financial mathematics, and he is about to pursue his PhD from Corvinus University of Budapest. In recent years, he has worked in the banking industry. Currently, he is developing statistical models with R. His interest lies in large networks and computational complexity.

dm Banai has received his MSc degree in investment analysis and risk management from Corvinus University of Budapest. He joined the Financial Stability department of the Magyar Nemzeti Bank (MNB, the central bank of Hungary) in 2008. Since 2013, he is the head of the Applied Research and Stress Testing department at the Financial System Analysis Directorate (MNB). He is also a PhD student at the Corvinus University of Budapest since 2011. His main research fields are solvency stress-testing, funding liquidity risk, and systemic risk.

Gergely Darczi is a former assistant professor of statistics and an enthusiastic R user and package developer. He is the founder and CTO of an R-based reporting web application at http://rapporter.net and a PhD candidate in sociology. He is currently working as the lead R developer/research data scientist at https://www.card.com/ in Los Angeles. Besides maintaining around half a dozen R packages, mainly dealing with reporting, Gergely has coauthored the books Introduction to R for Quantitative Finance and Mastering R for Quantitative Finance (both by Packt Publishing) by providing and reviewing the R source code. He has contributed to a number of scientific journal articles, mainly in social sciences but in medical sciences as well.

Barbara Dmtr is an assistant professor of the department of Finance at Corvinus University of Budapest. Before starting her PhD studies in 2008, she worked for several multinational banks. She wrote her doctoral thesis about corporate hedging. She lectures on corporate finance, financial risk management, and investment analysis. Her main research areas are financial markets, financial risk management, and corporate hedging.

Gergely Gabler is the head of the Business Model Analysis department at the banking supervisory division of National Bank of Hungary (MNB) since 2014. Before this, he used to lead the Macroeconomic Research department at Erste Bank Hungary after being an equity analyst since 2008. He graduated from the Corvinus University of Budapest in 2009 with an MSc degree in financial mathematics. He has been a guest lecturer at Corvinus University of Budapest since 2010, and he also gives lectures in MCC College for advanced studies. He is about to finish the CFA program in 2015 to become a charterholder.

Dniel Havran is a postdoctoral research fellow at Institute of Economics, Centre for Economic and Regional Studies, Hungarian Academy of Sciences. He also holds a part-time assistant professor position at the Corvinus University of Budapest, where he teaches corporate finance (BA, PhD) and credit risk management (MSc). He obtained his PhD in economics at Corvinus University of Budapest in 2011.

Pter Juhsz holds a PhD degree in business administration from the Corvinus University of Budapest and is also a CFA charterholder. As an associate professor, he teaches corporate finance, business valuation, VBA programming in Excel, and communication skills. His research field covers the valuation of intangible assets, business performance analysis and modeling, and financial issues in public procurement and sports management. He is the author of several articles, chapters, and books mainly on the financial performance of Hungarian firms. Besides, he also regularly acts as a consultant for SMEs and is a senior trainer for EY Business Academy in the EMEA region.

István Margitai is an analyst in the ALM team of a major banking group in the CEE region. He mainly deals with methodological issues, product modeling, and internal transfer pricing topics. He started his career with asset-liability management in Hungary in 2009. He gained experience in strategic liquidity management and liquidity planning. He majored in investments and risk management at Corvinus University of Budapest. His research interest is the microeconomics of banking, market microstructure, and the liquidity of order-driven markets.

Ágnes Tuza holds an applied economics degree from Corvinus University of Budapest and is an incoming student of HEC Paris in International Finance. Her work experience covers structured products' valuation for Morgan Stanley as well as management consulting for The Boston Consulting Group. She is an active forex trader and shoots a monthly spot for Gazdaság TV on an investment idea where she frequently uses technical analysis, a theme she has been interested in since the age of 15. She has been working as a teaching assistant at Corvinus in various finance-related subjects.

Milán Badics has a master's degree in finance from the Corvinus University of Budapest. Now, he is a PhD student and a member of the PADS PhD scholarship program. He teaches financial econometrics, and his main research topics are time series forecasting with data-mining methods, financial signal processing, and numerical sensitivity analysis on interest rate models. He won the competition of the X. Kochmeister-prize organized by the Hungarian Stock Exchange in May 2014.

Kata Vradi is an assistant professor at the Department of Finance, Corvinus University of Budapest since 2013. Kata graduated in finance in 2009 from Corvinus University of Budapest and was awarded a PhD degree in 2012 for her thesis on the analysis of the market liquidity risk on the Hungarian stock market. Her research areas are market liquidity, fixed income securities, and networks in healthcare systems. Besides doing research, she is active in teaching as well. She mainly teaches corporate finance, investments, valuation, and multinational financial management.

István Margitai is an analyst in the ALM team of a major banking group in the CEE region. He mainly deals with methodological issues, product modeling, and internal transfer pricing topics. He started his career with asset-liability management in Hungary in 2009. He gained experience in strategic liquidity management and liquidity planning. He majored in investments and risk management at Corvinus University of Budapest. His research interest is the microeconomics of banking, market microstructure, and the liquidity of order-driven markets.

Pter Medvegyev has an MSc degree in economics from the Marx Kroly University Budapest. After completing his graduation in 1977, he started working as a consultant in the Hungarian Management Development Center. He got his PhD in Economics in 1985. He has been working for the Mathematics department of the Corvinus University Budapest since 1993. His teaching experience at Corvinus University includes stochastic processes, mathematical finance, and several other subjects in mathematics.

Ãgnes Vidovics-Dancs is a PhD candidate and an assistant professor at the Department of Finance, Corvinus University of Budapest. Previously, she worked as a junior risk manager in the Hungarian Government Debt Management Agency. Her main research areas are government debt management (in general) and sovereign crises and defaults (in particular). She is a CEFA and CIIA diploma holder.

Julia Molnr is a PhD candidate at the Department of Finance, Corvinus University of Budapest. Her main research interests include financial network, systemic risk, and financial technology innovations in retail banking. She has been working at McKinsey & Company since 2011, where she is involved in several digital and innovation studies in the area of banking.

Balzs rpd Szcs is a PhD candidate in finance at the Corvinus University of Budapest. He works as a research assistant at the Department of Finance at the same university. He holds a master's degree in investment analysis and risk management. His research interests include optimal execution, market microstructure, and forecasting intraday volume.

Balzs Mrkus has been working with financial derivatives for over 10 years. He has been trading many different kinds of derivatives, from carbon swaps to options on T-bond futures. He was the head of the Foreign Exchange Derivative Desk at Raiffesien Bank in Budapest. He is a member of the advisory board at Pallas Athn Domus Scientiae Foundation, and is a part-time analyst at the National Bank of Hungary and the managing director of Nitokris Ltd, a small proprietary trading and consulting company. He is currently working on his PhD about the role of dynamic hedging at the Corvinus University of Budapest, where he is affiliated as a teaching assistant.

Tams Vadsz has an MSc degree in economics from the Corvinus University of Budapest. After graduation, he was working as a consultant in the financial services industry. Currently, he is pursuing his PhD in finance, and his main research interests are financial economics and risk management in banking. His teaching experience at Corvinus University includes financial econometrics, investments, and corporate finance.