Konstantinos Zafeiriadis

Investor & M&A Advisor | Business Consultant

📍 United States🔄 Updated September 2026💼 1 investments📅 4 years investing🗓 Last invested Jun 2022
VC🌍 United States
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Investor & M&A Advisor | Business Consultant
Jun 2022
John Stadler is an educator and start-up investor with seven years experience in China. He has been a principal, an investor, teacher, and Board member in several schools in China, ranging from Eton Academy (a kindergarten) to the Institute of Digital Design (a post-graduate training program in Animation, Visual Effects, and Compositing). Stadler wrote the first comprehensive consumer’s guide to international education in China – the Stadler’s Guide to Education for Beijing and Shanghai. He has investigated over 150 schools as due diligence for investments in the education sector in China. Prior to China, Stadler founded the Parker Charter School (www.parker.org) in Devens, Massachusetts (USA), where he was also a teacher. The school has grown in size and reputation; it is now one of the preeminent Essential schools (www.essentialschools.org) in the US; it has a long waiting list and students coming from nearly 40 districts in Massachusetts. In 1997 Stadler was one of the first teachers awarded the prestigious National Bureau of Professional Teaching Standards (www.nbpts.org) Master Teacher certification in High School Mathematics. Stadler was a co-founder or Director of several companies in Massachusetts, including Clearpoint Research Corporation, which grew from zero to $70M in revenue under his general management. Stadler is a graduate of Harvard College (AB in Economics, magna cum laude; 1975) and the Kennedy School of Government at Harvard (MPP, 1979; PhD student (ABD) 1980-1982).
Experience · 4 entries
All (4)
Investments (1)
2022
Investor & M&A Advisor | Business Consultant
Jun 2022
John Stadler is an educator and start-up investor with seven years experience in China. He has been a principal, an investor, teacher, and Board member in several schools in China, ranging from Eton Academy (a kindergarten) to the Institute of Digital Design (a post-graduate training program in Animation, Visual Effects, and Compositing). Stadler wrote the first comprehensive consumer’s guide to international education in China – the Stadler’s Guide to Education for Beijing and Shanghai. He has investigated over 150 schools as due diligence for investments in the education sector in China. Prior to China, Stadler founded the Parker Charter School (www.parker.org) in Devens, Massachusetts (USA), where he was also a teacher. The school has grown in size and reputation; it is now one of the preeminent Essential schools (www.essentialschools.org) in the US; it has a long waiting list and students coming from nearly 40 districts in Massachusetts. In 1997 Stadler was one of the first teachers awarded the prestigious National Bureau of Professional Teaching Standards (www.nbpts.org) Master Teacher certification in High School Mathematics. Stadler was a co-founder or Director of several companies in Massachusetts, including Clearpoint Research Corporation, which grew from zero to $70M in revenue under his general management. Stadler is a graduate of Harvard College (AB in Economics, magna cum laude; 1975) and the Kennedy School of Government at Harvard (MPP, 1979; PhD student (ABD) 1980-1982).
2019
FP&A Lead/Financial Business Partner
May 2019
The Challenge was the UKs largest social enterprise connecting and inspiring people across Britain to strengthen their communities. We worked on a local level to bring together people from all ages, ethnicities and walks of life, connecting communities and building trust. We are very proud of the 242,000 young people who took part in The Challenges programmes between 2009 and 2019, and of our staff who worked hard to give them all great experiences. Sadly, The Challenge went into administration in November 2019 and is now closed. Thankfully our programmes continue - the National Citizen Service through many providers across the country, and HeadStart through its new home with Family Action.
2018
FP&A Financial Business Partner
Oct 2018
The Complete Gift Card Solution. TDS Gift Cards, a division of Ziff Davis, is a leading provider of global gift card products and services to top-tier digital brands. Many of the fastest-growing streaming, rideshare, marketplaces, and similar companies are currently partnered with TDS to manage their gift card programs worldwide. TDS provides comprehensive professional services and processing technology for clients across all retailers, countries, currencies, and methods of distribution. Currently, TDS is servicing clients’ programs in over 40 countries and delivering cards and codes to consumers through a worldwide network of leading distribution retail, online, and third-party outlets. TDS Gift Cards is headquartered in Minneapolis, Minnesota, with employees located around the world to service clients’ global payment needs. The TDS culture and business have been built upon an entrepreneurial drive created by experienced leaders and a team of people who thrive in a fast-paced, dynamic, creative, and energetic environment.
2010
Project Financial Modeller (Private Public Partnership)
Oct 2010
Aegean Motorway is the Concessionaire for the Maliakos-Kleidi section of PATHE Motorway in Greece (A1/ TERN) extending over 230km, from Raches I/C to Kleidi I/C. A major infrastructure PPP project, the Maliakos-Kleidi Motorway, once completed, will constitute a safe, modern, high speed motorway linking Athens and Thessaloniki, offering drivers enhanced safety levels and high quality of services. Since 2007, when the Concession Agreement was signed with the Greek State, the company has been entrusted with the design, financing, operation, maintenance, operation and exploitation of the road, constructing the new sections and maintaining/ upgrading the existing ones. Currently at approx. 95% of the construction progress, works at different stages of completion include the largest road tunnel of the Balkans (at Tempi), 20 bridges, 5 new Motorist Stations, 3 I/Cs and other structures. The company’s focus on road safety remains a constant parameter underpinning all its initiatives, works and efforts – Aegean Motorway is the only Greek company recognized for its coordinated action on road safety certified for its Road Safety Management System for the Motorway (as per ISO 39000:2012). This is not the only Certificate that the company holds – Aegean Motorway is certified for its Managing Systems covering Energy, SA, Occupational H&S, Environment and Quality. The company has also been honored with the Hellenic Responsible Business Award and the Award on “Behavioral Risk Management” by the H&S Awards. On the social front, Aegean Motorway supports varied causes through its CSR programs across the Prefectures that the Maliakos-Kleidi Motorway crosses. These include food banks, schools, and institutions as well as sponsorship for events or conferences or public awareness campaigns. On the commercial front, the company via its dedicated electronic toll collection service e-way offers discount packages for frequent users of the motorway.