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One by AOL

Logo: The original uploader was Andrewwiki12345 at English Wikipedia ., Public domain, via Wikimedia Commons⁴

Advertising company

One by AOL, formerly known as Millennial Media, was an advertising company that places display ads on mobile devices (mobile marketing).³ From Wikipedia, CC BY-SA 4.0

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Last updated Oct 19, 2026.

Overview

2006Founded¹

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TickerMM on NYSE¹
IndustryServices-Advertising Agencies¹
HeadquartersBaltimore¹
Founded inBaltimore¹
Websitewww.onebyaol.com
Incorporated inDE⁵
Business address2400 Boston Street, Suite 301, Baltimore, Md 21224⁵
Filer categoryAccelerated filer⁵

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One by AOL, formerly known as Millennial Media, was an advertising company that places display ads on mobile devices (mobile marketing).³

The story

One by AOL was founded as Millennial Media in May 2006 by Paul Palmieri and Chris Brandenburg. The company received $64.8M in funding between 2007 and 2011 from venture capitalists, and went on to acquire several companies, including TapMetrics in 2010, Condaptive in 2011, Jumptap in 2013, and Nexage in 2014.

In January 2012, Millennial Media filed with the SEC for an initial public offering of its common stock, and the company was first listed in March 2012.

On January 27, 2014, Palmieri stepped down from his position and was replaced by Michael Barrett.

On September 3, 2015, AOL agreed to buy Millennial Media for US$238 million. On October 23, 2015, AOL completed the acquisition, and changed the name to ONE by AOL.

From Wikipedia’s article on One by AOL, shared under CC BY-SA 4.0.⁶

Leadership

Who has led One by AOL, and when. Pick a name to see everywhere that person has worked.

Chief executive

President

Chief financial officer

Chief operating officer

2010201520202025

Chief executive officerMichael G. Barrett Jan 28, 2014 to Oct 23, 2015⁷
Chief executive officerPaul J. Palmieri Mar 28, 2012 to Nov 29, 2013⁸
PresidentMichael G. Barrett Jan 28, 2014 to Oct 23, 2015⁷
PresidentMatthew Gillis Nov 12, 2014 to Oct 23, 2015⁹
PresidentPaul J. Palmieri Mar 28, 2012 to Nov 29, 2013⁸
Chief financial officerAndrew J. Jeanneret Sep 22, 2014 to Oct 23, 2015¹⁰
Chief financial officerMichael B. Avon Mar 28, 2012 to May 19, 2014¹¹
Chief operating officerErnest Cormier Jun 5, 2015 to Oct 23, 2015¹²
Chief operating officerStephen T. Root Mar 28, 2012 to Dec 26, 2012¹³

Board members and other officers (24)

Vice President & SecretaryJulie M. Jacobs Oct 26, 2015 to Oct 26, 2015¹⁴
VP, Controller & TreasurerLara Sweet Oct 26, 2015 to Oct 26, 2015¹⁵
SVP & Chief Accting OfficerMichael Kocorowski Sep 10, 2014 to Oct 23, 2015¹⁶
EVP, StrategyMarc Theermann Oct 30, 2014 to Oct 23, 2015¹⁷
Gen. Counsel & Ch. Privacy OfrHo Shin Feb 15, 2013 to Oct 23, 2015¹⁸
EVP, InternationalStephen T. Root Feb 26, 2013 to Mar 1, 2013¹⁹
EVP, Global Product & PlatformMatthew Gillis Apr 29, 2013 to Sep 22, 2014²⁰
SVP, Accounting and ControllerAndrew J. Jeanneret Mar 28, 2012 to Aug 18, 2014²¹
EVP, Chief Technology OfficerJohn Christopher Brandenburg Mar 28, 2012 to Mar 14, 2013²²
EVP, Chief Marketing OfficerMary Spilman Oct 2, 2012 to Aug 4, 2014²³
Board memberJulie M. Jacobs Oct 26, 2015 to Oct 26, 2015¹⁴
Board memberMichael G. Barrett Jan 28, 2014 to Oct 23, 2015⁷
Board memberRoss Levinsohn Feb 19, 2014 to Oct 23, 2015²⁴
Board memberThomas R. Evans Feb 19, 2014 to Oct 23, 2015²⁵
Board memberErnest Cormier Dec 10, 2014 to Dec 10, 2014²⁶
Board memberAlan Macintosh Mar 28, 2012 to May 20, 2014²⁷
Board memberArun Gupta Mar 28, 2012 to Apr 30, 2013²⁸
Board memberGeorge Zachary Mar 28, 2012 to Apr 30, 2013²⁹
Board memberJames Albert Tholen Mar 28, 2012 to Oct 23, 2015³⁰
Board memberJohn D. Markley Jr. Mar 28, 2012 to Jan 3, 2014³¹
Board memberPatrick J. Kerins Mar 28, 2012 to Oct 23, 2015³²
Board memberPaul J. Palmieri Mar 28, 2012 to Nov 29, 2013⁸
Board memberRobert P. Goodman Mar 28, 2012 to Oct 23, 2015³³
Board memberWenda Harris Millard Mar 28, 2012 to Oct 23, 2015³⁴

Timeline

Jan 28, 2014New chief executive Michael G. Barrett becomes CEO⁷
Mar 28, 2012New chief executive Paul J. Palmieri becomes CEO⁸
Mar 2012Went public Listed on NYSE¹
2006Founded Founded in Baltimore¹

Sources

The numbers on this page point here. Each one links to the record it came from.

1
WikidataOne by AOL on Wikidata
2
SEC EDGAROne by AOL filings on SEC EDGAR
3
WikipediaOne by AOL on Wikipedia
4
Wikimedia CommonsOne by AOL logo by The original uploader was Andrewwiki12345 at English Wikipedia ., Public domain
5
SEC EDGAROne by AOL filings on SEC EDGAR
6
WikipediaOne by AOL on Wikipedia (revision used)
7
SEC EDGARMichael G. Barrett, Chief executive officer
8
SEC EDGARPaul J. Palmieri, Chief executive officer
9
SEC EDGARMatthew Gillis, President
10
SEC EDGARAndrew J. Jeanneret, Chief financial officer
11
SEC EDGARMichael B. Avon, Chief financial officer
12
SEC EDGARErnest Cormier, Chief operating officer
13
SEC EDGARStephen T. Root, Chief operating officer
14
SEC EDGARJulie M. Jacobs, Vice President & Secretary
15
SEC EDGARLara Sweet, VP, Controller & Treasurer
16
SEC EDGARMichael Kocorowski, SVP & Chief Accting Officer
17
SEC EDGARMarc Theermann, EVP, Strategy
18
SEC EDGARHo Shin, Gen. Counsel & Ch. Privacy Ofr
19
SEC EDGARStephen T. Root, EVP, International
20
SEC EDGARMatthew Gillis, EVP, Global Product & Platform
21
SEC EDGARAndrew J. Jeanneret, SVP, Accounting and Controller
22
SEC EDGARJohn Christopher Brandenburg, EVP, Chief Technology Officer
23
SEC EDGARMary Spilman, EVP, Chief Marketing Officer
24
SEC EDGARRoss Levinsohn, Board member
25
SEC EDGARThomas R. Evans, Board member
26
SEC EDGARErnest Cormier, Board member
27
SEC EDGARAlan Macintosh, Board member
28
SEC EDGARArun Gupta, Board member
29
SEC EDGARGeorge Zachary, Board member
30
SEC EDGARJames Albert Tholen, Board member
31
SEC EDGARJohn D. Markley Jr., Board member
32
SEC EDGARPatrick J. Kerins, Board member
33
SEC EDGARRobert P. Goodman, Board member
34
SEC EDGARWenda Harris Millard, Board member