Executive Board

Leading the Way into the Stratosphere

The HAPS Alliance Board is comprised of thought leaders in their respective fields. They have in-depth knowledge and extensive experience in their areas of specialization, including telecom, aerospace, communication technologies as well as emerging applications of Internet of Things (IoT), regulatory policy development, and more. To learn more about our executive team and directors, please access their bios below.

To learn more about our executive team and directors, please access their bios below. 



Ken Riordan

Principal Architect
Nokia Federal Solutions


Ken Riordan is Principal Architect, Nokia Federal Solutions.  Prior to joining Nokia, Riordan was Head of Product Management, Connectivity Solutions at Loon LLC (an Alphabet company).  Loon was a pioneer in HAPS technology, having launched the first ever commercial HAPS networks.  While with Loon, Riordan helped to form the HAPS Alliance and served as the Alliance’s first President.

Throughout his career, Riordan has developed products focused on mobile devices and network equipment and worked to launch networks that span the full history of cellular communications standards, including AMPS, GSM, CDMA, WiMAX, LTE and 5G. Riordan served on the Executive Board of the Small Cell Forum and as Technical Committee Chair and Forum Vice-chair for the Wireless Innovation Forum (formerly SDR Forum). He has been a contributor to 3GPP and has supported regulatory and export control policy development for the Federal Communications Commission (FCC) and the Department of Commerce (DOC). Riordan holds a degree in Electrical Engineering from the Georgia Institute of Technology.



Russ Van Der Werff

VP Stratospheric Solutions


Russ Van Der Werff serves as VP Stratospheric Solutions at Aerostar.  Prior to this role he managed the Stratospheric Platform Design Team. Aerostar has been in the stratosphere since their founding in 1956, building systems for NASA, the US military, and commercial enterprises such as Loon.  Aerostar balloons have logged over a million hours in the stratosphere over the last five years.

With over fifteen years of engineering and leadership experience, Russ helped grow the Aerostar engineering team from a couple dozen to more than one hundred engineers, designers, and technicians.  He also serves as stratospheric ambassador, spreading the Gospel of Ballooning, and recently presented a HAPS-related TED talk

Prior to Aerostar, Russ was Director of Product Management for Sencore, a private company building video transcoders and satellite modulators for broadcast applications.

Russ holds Bachelor’s degrees in Electrical Engineering, Computer Science, and Mathematics, as well as a Master's degree in Business Administration.


Roser Roca-Toha is an aviation industry professional with more than 15 years of experience in the aerospace sector. She has occupied a variety of roles from engineering, programme management, business development and Sales & Marketing. Roser has operated internationally and lived in 5 different countries. Roser was appointed Head of UAS Product Marketing in Jun 2019, based in Munich, Germany. In this role, Roser and her team are in charge of analyzing the UAS market requirements, ensuring UAS products development aligns with the market and customer needs.

Executive Board of Directors

Dex Halpin


Vice President and General of AV HAPS


Dex has been with AeroVironment for 5 years as the Vice President and General Manager of AV HAPS and leads the flight test team acting as Chief Test Pilot, Lead Crew Instructor, and Flight Test Manager. He has also served as the Chief Pilot and STaC Manager for Amazon Prime Air on the Data Acquisition Team. Prior to these roles, Dex was in the Royal Air Force where he had the privilege of being at the forefront of many of the unmanned system initiatives being adopted by the UK MoD such as the trialing of the Insitu / Boeing ScanEagle with the Joint Test & Evaluation Group, standing up the first UK MQ-9 Reaper Squadron at Creech AFB, establishing and commanding a UK MQ-9 Training Unit at Holloman AFB, and being appointed as the first Unmanned Systems Advisor in the UK’s Defense Science Technology Laboratory (DSTL), working alongside the major UK Defense industries to bring unmanned and autonomous system capability to the UK.

Antje Williams


Senior Vice President in Group Technology
Deutsche Telekom AG


Antje Williams is appointed as Senior Vice in Group Technology for Business Creation since April 2022. In 2024 she additionally took over satellite program lead for the group being responsible for the development of satellite connectivity offering in different aeras of DT, the negotiations with the satellite provider, the engagement in different publicly funded research activities and the ground network support for European Satellite Systems.

Prior to this she was product owner regarding 5G Campus Networks which she took over in October 2018. Antje started 2015 in the former CTO department and was leading for 3 years the 5G program within Deutsche Telekom focussing on standardization and the introduction of 5G.

Starting in 2010 Antje was Head of Inflight Connectivity and Managing Director of T-Mobile HotSpot GmbH (subsidiary of Deutsche Telekom). She was responsible offering WIFI access on board of 15 airlines (in 2014). Before joining Inflight, Antje was Head of Sales for the national Wholesale Department in Southern Germany for five years. She was responsible for the fixed line business with customers as Telefónica Germany, Kabeldeutschland, BT Germany among others. Antje started in 2001 in the Legal Department of Deutsche Telekom.

Mikkel Vestergaard


Sceye, Inc


Over the past 2 decades I have had several board seats in both membership-based organizations and organizations seeking to shape the regulatory and normative landscape. This experience has provided me with relevant qualifications to serve on the HAPS Alliance board as I’ve likely experienced most of the challenges the board will be faced with.

My interest in joining the board of the HAPS Alliance is to use my experience in providing appropriate governance and offering an eye-on-the-horizon as the HAPS Alliance harvest the collective powers of it’s members to change the normative landscape, and make HAPS in the stratosphere as normal as cars on the road or ships in the sea.

Ayako Sato


Research Institute of Advanced Technology, Business Planning Department, Strategic Partnership Section
SoftBank Corp.