Home Ad Exchange News MediaMath CMO Joanna O’Connell Exits, Returns To Forrester

MediaMath CMO Joanna O’Connell Exits, Returns To Forrester

SHARE:

MediaMath CMO Joanna O’Connell will depart the company at the end of the month and return to Forrester, where she was a principal analyst for interactive marketing for three years.

Prior to MediaMath, O’Connell was an AdExchanger research analyst and held several ad tech roles at VivaKi and Razorfish in her 15-plus years in digital advertising.

“I’ve gotten a lot of practical experience in my time at MediaMath and I go back to the analyst world far wiser for it,” she told AdExchanger.

O’Connell will begin in early October and will spearhead Forrester’s digital advertising coverage, replacing its current programmatic analyst, Richard Joyce, who has since headed to Neustar, according to his LinkedIn profile.

O’Connell said the move was for personal reasons: “It had more to do with my personal passion, which is being a voice for the whole industry, rather than just being a voice for one company.” 

Earlier this year, the nine-year-old MediaMath restructured to set the company up for growth in its next phase – though O’Connell said that’s not the reason for her leaving.

“It is not because of, but in spite of, MediaMath that I’m moving on,” she said. “My [departure] has nothing to do with company health, trajectory or my confidence in the senior leadership team.”

As MediaMath increased its enterprise contracts, it also deepened its technology infrastructure and data services.

“If you’re an advertiser and you wanted choice, we wanted to build to give you that choice,” O’Connell said.

Must Read

Gamera Raises $1.6 Million To Protect The Open Web’s Media Quality

Gamera, a media quality measurement startup for publishers, announced on Tuesday it raised $1.6 million to promote its service that combines data about a site’s ad experience with data about how its ads perform.

Jamie Seltzer, global chief data and technology officer, Havas Media Network, speaks to AdExchanger at CES 2026.

CES 2026: What’s Real – And What’s BS – When It Comes To AI

Ad industry experts call out trends to watch in 2026 and separate the real AI use cases having an impact today from the AI hype they heard at CES.

New Startup Pinch AI Tackles The Growing Problem Of Ecommerce Return Scams

Fraud is eating into retail profits. A new startup called Pinch AI just launched with $5 million in funding to fight back.

Privacy! Commerce! Connected TV! Read all about it. Subscribe to AdExchanger Newsletters
Comic: Shopper Marketing Data

CPG Data Seller SPINS Moves Into Media With MikMak Acquisition

On Wednesday, retail and CPG data company SPINS added a new piece with its acquisition of MikMak, a click-to-buy ad tech and analytics startup that helps optimize their commerce media.

How Valvoline Shifted Marketing Gears When It Became A Pure-Play Retail Brand

Believe it or not, car oil change service company Valvoline is in the midst of a fascinating retail marketing transformation.

AdExchanger's Big Story podcast with journalistic insights on advertising, marketing and ad tech

The Big Story: Live From CES 2026

Agents, streamers and robots, oh my! Live from the C-Space campus at the Aria Casino in Las Vegas, our team breaks down the most interesting ad tech trends we saw at CES this year.