The HackMaster Network is composed of leading technologists, entrepreneurs, venture capitalists and executives that provide support in the execution of HackDays around the globe. HackMasters will also mentor HackDay winners as they seek to grow their ideas from a prototype to a Company.

Demian M. Bellumio is the founder of the HackDay Foundation and also currently the COO of Senzari, Inc., a leading Internet radio service with a particular focus on International markets. Demian is also an active investor through Quotidian Ventures LLC, a seed to early-stage investment fund that invests in great visionaries building global companies whose services we want to incorporate into our everyday life. Previously, Demian was the founder and president of Hoodiny Entertainment Group, LLC., which developed the Cyloop Music Network to power a variety of strategic partners, including MSN Music. Prior to founding Hoodiny, Demian was the vice president of corporate finance & development at Terremark Worldwide, Inc., a leading provider of Internet infrastructure services in the U.S., Latin America and Europe.  In addition, Demian is a founding member and shareholder of BroadSpan Capital, Ltd., an investment banking firm that specializes in Latin America and the U.S. Hispanic market, with offices in Miami and Rio de Janeiro. Demian began his career in banking at Barclays Capital, the investment-banking arm of Barclays Bank PLC. Demian received his B.B.A. in finance, international business and marketing from Florida International University (FIU) in 2000. He is a member of the board of FIU’s Americas Venture Capital Conference, the leading VC conference uniting South Florida and Latin America. Demian was born in Buenos Aires, Argentina.

Chris Boos is a technology geek with foundations in the fieldsof graph theory and algorithm design. Chris has worked on algorithms for massive parallel computing as well as adaptive multi path routing and is now involved with knowledge algorithms and experienced based computing.  As board member and founder of arago AG, Chris created a high-tech company with high-tech people which is now focusing on IT automation. You can follow his ideas about IT automation and cloud computing on his personal blog.  Chris has authored many academic and business publications, focusing on automation in IT operations, information modeling, and sourcing solutions. Chris was also awarded the John F. Kennedy National Leadership Award. Chris studied computer sciences at ETH Zürich and the Technical University Darmstadt. 

Juan Pablo Cappello is one of the principal shareholder (senior partner) at Greenberg Traurig P.A., the fourth largest law firm in the United States, responsible for coordinating the firm’s practice in Latin America. Prior to joining Greenberg Traurig, Mr. Cappello was EVP, Corporate Secretary, and General Counsel of Patagon, a financial institution with retail brokerage and banking operations in Spain, Germany, Brazil, Mexico, Argentina, Chile, Venezuela, and the U.S. While at Patagon, he structured acquisitions of financial institutions in six countries and the sale of a controlling interest in Patagon to Banco Santander for a transaction value of over US$750 million. Earlier in his career, Mr. Cappello was the General Counsel and SVP of SKY Latin America, an over $1 billion joint venture of News Corp, Televisa, Globo and Liberty Media. He also established The Private Advising Group, a unique and successful international private equity and strategic consulting firm. Mr. Cappello, a Chilean native, is a graduate of Duke University and NYU School of Law (Law Review), and serves on the global advisory board of the Endeavor Foundation, a not-for-profit that promotes entrepreneurship in developing markets.

Marco Giberti is a successful entrepreneur and angel investor with more than 20 years of intensive experience in marketing and communications with focus on the media, internet and events industry. After several years in a successful career as a corporate executive at Apple computers, Mr. Giberti decided to give free rein to his entrepreneurial spirit and became Co-founder and Board Member of Mind Opener, a leading publishing group in Latin America that was later sold to British Pearson Media Group, and Co-founder and Board Member of e-mind, an internet and media communications company that was sold to Liberty Media.  He also served as President, CEO and co-founder of Mind Trainer, a firm specialized in the organization of major regional trade-shows and events. After a very successful growth, regional expansion and partnerships, including a long term relationship with E.J.Krause, Reed Elsevier bought a controlling position in the business 2005, and Mr. Giberti became its president and regional partner for the events and trade show division in Latin America, a role he has been performing since then. Under Mr. Giberti’s leadership, Reed Exhibitions Latin America became the leading company in the region organizing more than 50 events annually in different markets in Latin America including Brazil, Mexico and Argentina. Mr. Giberti is a Harvard Business School OPM Graduate, and member of YPO, the Young Presidents Organization.

José E. González is a C-Level executive with over 25 years of domestic and international experience, having served as a member of senior executive teams for over 15 years. His broad range of expertise includes intellectual property, technology, consumer marketing, manufacturing, digital & social media, entertainment, securities, transactions, international development, project management, and licensing. José just finished working with Prisa Digital to integrate certain assets Prisa purchased from Hoodiny Entertainment Group. Prior to the Prisa engagement he served as EVP, Business & Legal Affairs for Hoodiny, where he managed day-to-day commercial, operational and legal matters, and supporting the CEO as de-facto COO. Prior to Hoodiny, José was Chief Legal Counsel and later SVP, Business Affairs at Terremark Worldwide, Inc. As CLO (2000-2004), he oversaw the legal functions of this fast paced, publicly traded company; as SVP Business Affairs (2004-2007), he filled multiple roles: headed the global IS group, managed the Business Process office, assisted the CEO on international development matters throughout EMEA, and worked with the COO on developing and launching new products and services. Previously, he held a number of legal roles at Sunbeam Corporation, Blockbuster Entertainment Group (then a Viacom, Inc. subsidiary) and American Express. José began his legal career with Donovan, Leisure, Newton & Irvine in New York, received his JD from Fordham School of Law and BA from Fordham University. He is a member of the NY Bar, can serve as Authorized In-House Counsel under the Florida Bar rules, and is fluent in Spanish.

Bill Hajjar is CEO and Founder of Senzari Corporation. Bill has more than 15 years of international experience in the mobile telecommunications field, working in both sales and business development positions at both public and startup companies. He has a highly-successful track record in hardware, software, service and support channel development. Prior to founding Senzari, Bill founded Blue Wave Wireless, a location-based payment and logistics company. Before Blue Wave, Bill was on the founding team and was the International Director of Business Development and Sales at Wherify Wireless (OTB:WFYW), where he lead the team that successfully launched Wherify’s product and service in 19 countries and was responsible for executing hardware and services transactions in major emerging markets with major telecom players. Previously, Bill was VP of Western US for eSupportNow, an on-line Customer Relationship Management platform. Bill also served as VP of Worldwide Sales for Verecomm, an industry leading test management software platform. Bill is a graduate of the Carroll School of Management at Boston College.

Esteban Sosnik is co-founder and CEO of Atakama Labs, based in San Francisco, CA He oversees the company’s business and corporate development, marketing and is responsible for the growth of the business and its P&L. Esteban was a founder and CEO of Wanako Games, an award winning console game developer that was acquired by Vivendi Games (currently Activision Blizzard) in December 2006. Esteban led the company’s funding process, its strategy and business development. After the acquisition of Wanako by Vivendi, Esteban became Vice President of Business Development at Sierra Online, division of Vivendi Games, focused on online console and free-to-play games. At Vivendi Esteban was part of the team that led the launch of World of Warcraft in Latin America and helped execute the business plan of Sierra Online in the free-to-play / casual online game market. Previous to founding Wanako, Esteban was CEO of Penguin Holdings, a seed-stage Venture Capital fund for Latin American start-ups, where he helped jumpstart more than ten new companies throughout the region and was a board member in many of them. Before joining Penguin, Esteban served as Associate in Innova Capital Argentina, a private equity fund focused on the food and beverage industries in Argentina and, before that, he was an investment banking analyst at JP Morgan in the M&A Latin America Group based in New York. Esteban graduated with honors from the University of Virginia with a degree on Economics and Foreign Affairs. He also completed the Management Development for Entrepreneurs program at UCLA’s Anderson School of Business.

Jose Tolosa has served as SVP of Strategy and Business Development for Viacom International Media Networks (“VIMN”) since June 2009. From his position, Mr. Tolosa is responsible for overall strategy and business development across all of VIMN’s brands internationally, including MTV, Nickelodeon, Comedy Central, VIVA, VH1, and TMF, as well as its digital assets. Additionally, Mr. Tolosa works closely with VIMN’s Senior Management in the implementation of long-term business plans for the company and identifying and leading the various growth strategies worldwide. Previously, he served as VP of Strategy and Business Development at MTV Networks Latin America since February 2008. Before joining MTV Networks Latin America, Mr. Tolosa was SVP/Chief Operating Officer at the HNMA Funding Company out of San Diego, CA. Prior to this, Tolosa was a Principal at The Parthenon Group, a strategy consulting firm based in Boston, MA, where he was a strategic advisor to senior management in various corporations. From 1997-2002, Tolosa was involved in the Latin America media space, first as an investment banker at Bear Stearns and Co. where he advised various companies in capital raising activities and mergers and acquisitions, and then as an Asst. Vice-President for Claxson Interactive Group, Inc.. During his time at Claxson, Mr. Tolosa was part of the team that led the successful IPO of “El Sitio” and the subsequent merger into Claxson, while also leading the acquisition and disposition of various digital assets across multiple countries in Latin America. A native of Puerto Rico, Tolosa holds an MBA from the Harvard Business School and a BS in Finance and Accounting from Georgetown University.

Loading tweets...



The HackDay Foundation, is a non-profit organization focused on organizing a series of International hackathons to promote startup development in select cities around the globe.