Executive record
Bill Dunnion
Career profile: Bill Dunnion on CISO Spotlights ↗
Bill Dunnion was named Chief Information Security Officer (CISO) at Mitel. The appointment was announced in the week of April 15, 2024, per SecurityWeek Industry Moves.
Before the appointment: a security leadership role at Calian, per the same source.
The record holds no later verification of the seat.
1 tracked move on the Wire · Updated
Background
Bill Dunnion's professional background as Mitel newsroom ↗ states it, read November 10, 2026.
Bill Dunnion had been at Mitel for just about six months at the time of this podcast interview. This is Dunnion's second tour at Mitel, following a first tour there back in the late 90s. During that first tour, his second job out of school, he worked in the product marketing team for Mitel. His first stint with the company lasted five years.
The first half of Dunnion's career was in telecom and telecommunications. The move to voiceover IP gave him his introduction to the IT world and ultimately the security world. The second half of his career has been in IT security. In the journey of his career, he has held roles in sales, marketing, product management and delivery. Bill Dunnion was interviewed in a podcast episode on the push for transparency in security breaches.
Career timeline
Every move the record holds for Bill Dunnion, newest first, with the earlier roles the announcements name.
· Appointment
Named Chief Information Security Officer (CISO) at Mitel
Source: SecurityWeek Industry Moves (week of 2024-04-15) ↗ · Move record
Before April 2024· Earlier role
Security leadership role at Calian
Named in the announcement of the Mitel appointment · Source: SecurityWeek Industry Moves (week of 2024-04-15) ↗
The appointment
Announced week of April 15, 2024 · Source: SecurityWeek Industry Moves (week of 2024-04-15) ↗ · Move record
Mitel announced the appointment of Bill Dunnion as CISO, where he will oversee information security strategy, security architecture, and security standards compliance. Prior to Mitel, Dunnion held IT and cybersecurity leadership positions at Calian, 2Keys Security Solutions, and Bell Canada.
According to the release, Dunnion will also assess, develop and implement security best practices throughout Mitel.
His most recent role was Senior Director of Corporate Cybersecurity at Calian, where he oversaw the corporate cybersecurity program's development, implementation and operation, the release says. According to the release, Dunnion ensured compliance with SOC2 and ISO standards at Calian and operationalized its program within the NIST framework. Calian said that Dunnion, who was its Director, Corporate Cybersecurity at the time of the report, discussed on the CIO Association of Canada website the hazards of using machine learning and AI tools without understanding the risks.
The release says Dunnion earned his mechanical engineering degree at Queen's University in Kingston, Ontario. According to the release, Dunnion served the Canadian Cyber Forum in Ottawa as its volunteer chair at the time of the announcement.
SecurityWeek describes Mitel as a provider of business communications solutions. According to the release, Mitel powers more than two billion business connections, and its experts serve business users in more than 100 countries. Since taking the CISO role in 2024, Dunnion has guided Mitel through Unify's integration and ISO compliance efforts, a Mitel blog post says.
The company: Mitel
- Sector
- Telecom & Media
- Region
- North America
- Company record
- Who runs security at Mitel: 1 confirmed move on the record
Appointed in the same period
Other security chiefs in Telecom & Media whose appointment was announced within 90 days of Bill Dunnion's, nearest first. The Telecom & Media bench
Matt Biber, Group Chief Information Security Officer at Qantas
Record facts
- Moves on the record
- 1 confirmed move, each with its source
- On the record since
- September 26, 2026
- Telecom & Media in 2026
- 3 security-leadership appointments announced in the sector on the record
Questions about Bill Dunnion
- When did Bill Dunnion become CISO of Mitel?
- The appointment was announced in the week of April 15, 2024, per SecurityWeek Industry Moves. The record holds the announcement, not a start date.
- Is Bill Dunnion still the CISO of Mitel?
- The newest source the record holds for this seat is the appointment announced in the week of April 15, 2024. It holds no later verification, so it does not state who holds the seat today.
- Where did Bill Dunnion work before Mitel?
- Before the appointment, Bill Dunnion was in a security leadership role at Calian, according to the announcement (SecurityWeek Industry Moves).
Sources
- 1.SecurityWeek Industry Moves (week of 2024-04-15) ↗: the appointment at Mitel, week of April 15, 2024
- 2.Mitel newsroom ↗: professional background, read November 10, 2026
- 3.CISO Spotlights career profile ↗: a fuller career profile on a sister site
This record begins with CISO Tribune's tracking in 2026.
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