Matthew O'Shea is the President of Matthew O'Shea Consulting, Inc. In 1994, Matthew started his public service career with State Representative Dan Rutherford and then worked for State Representative James Durkin and Senator Thomas Walsh from 1995 through 2000. While working for Representative Durkin and Walsh, Matt attended John Marshall Law School and completed his Juris Doctor in 2000. After leaving Representative Durkin and Senator Walsh, he served as the Village Administrator for the Village of Forest Park located in the western suburbs of Cook County. While serving as Village Administrator, Matt was also appointed to the Senate to fill out the remaining term of Senator Tom Walsh for the 22nd Legislative District.

As State Senator, Matt was able to learn and experience the legislative process from an elected official standpoint. In 2004, Matt joined House Republican Minority Leader Tom Cross as Deputy Chief and Ethics Officer before coming Chief of Staff. In his role as Chief of Staff, he dealt with all four legislative caucuses including participating in several high level leadership meetings. His role as Chief of Staff allowed him to deal with many important issues facing the legislature such as pensions, capital funding, energy, local government, budget, Medicaid and redistricting.

Matt has knowledge and experience working with many regulatory issues including those before Joint Committee on Administrative Rules. Matt has spent time working on many political elections at all levels of state government.

Mandy Drendel joined the Cornerstone Illinois team as a vice president in January 2021. She is an attorney and registered lobbyist with experience advocating on behalf of clients before the Illinois General Assembly and Executive Branch. As a contract lobbyist, Mandy's worked on behalf of industries including telecommunications, energy, gaming, healthcare, insurance, education and cannabis.

Prior to joining Cornerstone, she served as senior legal counsel in the Illinois Senate President's office where she worked on telecommunications, insurance, tax, and pension issues. During her tenure, Mandy helped lead major legislative initiatives including a telecommunications rewrite, small cell wireless deployment, major insurance legislations, revenue packages, property tax relief and pension reform.

Before that, Mandy served on the Senate Democratic legal team, and acted as the caucus's key regulatory and administrative rule specialist where she staffed the General Assembly's administrative rulemaking committee. This experience provided her direct access and insight into the regulatory arm of Illinois state government.

Mandy received a Juris Doctorate from the Loyola University Chicago School of Law and a Bachelor of Arts degree from Washington University in St. Louis, Missouri.

Julia Larkin joined Cornerstone Government Affairs in February 2020 with more than 12 years of legislative experience in the state of Illinois. In her role as vice president, Julia uses her skills to help clients in Illinois advance their advocacy goals. Prior to joining Cornerstone, Julia served as the director of advocacy and government relations at AMITA Health, one of the largest health systems in Illinois. During her time in this role, Julia represented the organization's mission with state and local officials and executive agency staff, while also creating and executing strategies to ensure specific policy goals were met.

Previously, Julia served as legislative coordinator to Speaker of the Illinois House Michael J. Madigan for 10 years, where she assisted in the development of a wide array of policy positions and legislative initiatives. Julia has also supported the Democratic Party of Illinois, where she led state representative campaigns, managed opposition research and oversaw state representative candidate recruitment efforts.

Julia received her Bachelor of Arts with a double major in political science and international studies from Loyola University in Chicago.

0-5 years

Will Cousineau joined Cornerstone's Springfield, Illinois office in June 2017. Will comes to the firm after nearly 18 years working for Illinois House Speaker Michael J. Madigan, including eight years as political director for the Speaker and the Democratic Party of Illinois.
Will was the longest serving political director for Speaker Madigan and most recently served as senior advisor to the Speaker. Over the past 10 years, Will worked directly with Speaker Madigan to shape, develop and implement the strategy and messaging for the Speaker's legislative and political agenda and the agendas of every member of the House Democratic Caucus. He also developed the implementation of political, legislative and outreach strategies for House Democratic Caucus members and all aspects of the Illinois House's political operation.

During his time with the Speaker's office, Will was involved in the major initiatives that moved through the Legislature over the past ten years, including such legislation concerning utilities, conceal and carry, financial institutions, and civil laws. Additionally, Will was intimately involved in the 2010 drawing of legislative districts, including new districts in the suburban region that have helped House Democrats expand and maintain their majority. While many democratic legislative caucuses across the country lost record numbers of seats during his tenure and every legislative chamber in the Midwest outside Illinois became Republican controlled, Will guided the Illinois House caucus and the Democratic Party of Illinois through a period of expansion and maintained a healthy majority for Illinois House Democrats.

Will's long tenure with the House, experience with message development, crisis management, grassroots organizing and input on political campaigns for offices throughout the state, gives Will an ability to understand complex legislative and political problems, easily digest those issues for members and clients and put together a collaborative and detailed action plan for moving forward.

In 2014, Will and his wife, Macy, adopted three sisters from Latvia. This experience has shaped their family, has given them the opportunity to speak with others about adoption and has encouraged their family to assist others who are adopting children both internationally and domestically. In 2016, Will and Macy's family grew with the arrival of their son.

In his spare time, Will is active in his church and serves on the Board of Elders. Will currently resides in Chatham, IL with his wife and four children.