Best professional companies in Chicago, IL

Winston & Strawn LLP is an international law firm with 950 attorneys among 11 offices in Charlotte, Chicago, Geneva, London, Los Angeles, Moscow, New York, Newark, Paris, San Francisco, and Washington, D.C. Our firm serves the needs of enterprises of all types and sizes, in both the private and the public sector. The exceptional depth and geographic reach of our resources enable Winston & Strawn to manage virtually every type of business-related legal issue. We understand that clients are looking for value beyond just legal expertise. With this in mind, we work hard to understand the level of involvement our clients want from us. We take time to learn about our clients' organizations and their business objectives. And, we place significant emphasis on technology and teamwork in an effort to respond quickly and effectively to our clients' needs. Winston & Strawn has built its reputation on the quality and character of its lawyers, past and present, many of whom are recognized leaders in the American legal community. Our history of more than 150 years is a chronicle of individuals and events that have helped shape the firm and create the strong foundation on which we continue to build. We remain committed to the traditions of client service, professional development, and community involvement instilled by our leaders of the past, while embracing the innovations driving the legal profession in the 21st century.

Kirkland & Ellis LLP is a law firm that provides legal advisory services in the areas of corporate transactions, intellectual property, restructuring, and tax. The Kirkland & Ellis Foundation provides financial support to non-profit, charitable, and law-related organizations serving a wide range of communities, initiatives and people. The foundation also partners with organizations to improve health care, educational opportunities, cultural awareness, emergency relief and humanitarian efforts, youth programs, and public policy and community outreaches. Kirkland & Ellis employs over 1,600 lawyers representing global clients in complex litigation and dispute resolution and arbitration, corporate and tax, restructuring, and intellectual property and technology matters. The firm has offices in Beijing, Chicago, Hong Kong, Houston, London, Los Angeles, Munich, New York, Palo Alto, San Francisco, Shanghai and Washington, D.C.

McDermott Will & Emery is a premier international law firm with a diversified business practice. Our lawyers represent a wide range of commercial, industrial and financial enterprises, both publically and privately held. McDermott has more than 1,100 lawyers located in 18 offices across the United States, Europe and Asia. Further extending our reach in Asia, we have a strategic alliance with MWE China Law Offices in Shanghai. McDermott partners with clients to accomplish their business objectives by providing superior counsel and service. The expansion of our international platform has supported numerous cross-border transactions and litigation matters, while providing the experience necessary to offer corporate, tax, labor and benefits, competition, intellectual property and regulatory counsel to clients across all industries. In the years to come, we will continue to expand geographically and enhance our existing practices and industry-focused strengths, and are committed to building from these strengths in order to best serve our clients and communities. McDermott has a long history of social responsibility and supporting the communities in which our people live and work. We believe it is our obligation to embrace our communities and promote their well being through pro bono work, community service, charitable giving, environmental stewardship and promoting diversity.

Whether the focus is on strategy or operations, on organizational change or strategic business technology, AT Kearney helps clients improve their products and services, their business relationships, and their bottom line economics.

Dentons is a global law firm. It provides a range of legal services. The company offers banking and finance, competition, corporate, dispute resolution, employment, intellectual property, real estate, reorganization, international trade, and tax legal services. It serves corporations, financial institutions, regulators, and government bodies across a wide range of industry sectors. Dentons is based in London, United Kingdom.

Founded in 2001, Balyasny Asset Management (BAM) is a global asset management firm dedicated to delivering consistent, uncorrelated absolute returns in all market environments. BAM's disciplined investment approach focuses on true alpha generation by combining a deep fundamental research team with an active risk management culture. The firm has offices in the United States, London & Hong Kong with more than 500 employees representing greater than 45 countries.

Mayer Brown is a global legal services provider advising clients across the Americas, Asia and Europe. Their geographic strength means they can offer local market knowledge combined with global reach.

Katten Muchin Rosenman LLP is a full-service law firm with nearly 700 attorneys in locations across the United States, London and Shanghai.

Heidrick & Struggles International, Inc. provides executive search and leadership consulting services in the Americas, Europe, and the Asia Pacific. It facilitates the recruitment, management, and deployment of senior executives for its clients' executive management and board positions. The company's leadership consulting services include succession planning, talent retention management, executive assessment, executive development, transition consulting for newly appointed executives, and M&A human capital integration consulting. Its customers include Fortune 1000 companies; the major non-U.S. companies; middle market and emerging growth companies; governmental, higher education, and not-for-profit organizations; and private and public entities.

As a Forbes Best Recruiting Firm with nearly 50 years in the insurance industry, Jacobson has the expertise to find your next great hire. Learn more here.

Leo Burnett operates as an advertising agency. It offers services such as quantitative research, context and strategic planning, optimization, segmentation and targeting, digital strategy, and specialty insights. It also offers services for film, television, mobile, press/print/editorial, promo, digital, media, radio, design, ambient/outdoor. Other services includes media buying, event sponsorship and management, database marketing, direct marketing, promotions, brand navigation, and digital work flow. Leo Burnett was established in 1935 in Chicago, Illinois. It has branches in Los Angeles and California. Leo Burnett operates as a subsidiary of Publicis Groupe SA.

Jenner & Block is an American law firm with offices in Chicago, London, Los Angeles, New York City and Washington, DC The firm is active in corporate litigation, business transactions, the public sector, and other legal fields.

Dyson Limited is a British technology company established in the United Kingdom by James Dyson in 1991.

Sargent & Lundy LLC provides consulting, engineering, design, analysis, and project services for various power generation and transmission projects for clients in public and private sectors worldwide. The company offers solutions for nuclear power services, including licensing support, engineering, design, field support, and project management; designs and services fossil-fueled power plants for investor-owned utilities, independent power producers/developers, and municipal/government agencies; and provides integrated environmental solutions, such as compliance planning, permitting, civil/geotechnical, water optimization, water resources consulting, modeling, siting and transmission routing, due diligence, and decommissioning services. It also provides power transmission services, including air and gas insulated substation design, program/construction management and commissioning, procurement and material management, system studies, regulatory compliance, owners engineering, EPC/EPCM, and transmission line and substation engineering training, as well as overhead, underground, and submarine transmission line design services; project assessment and implementation services for the renewable energy sector; and energy consulting services that include project development and planning, regulatory and environmental compliance support, due diligence and asset transaction, financial modeling and analysis, and operational assessment services, as well as owners engineering, EPC, and site services. In addition, the company offers construction management and commissioning; and operations and maintenance support services. Sargent & Lundy LLC was founded in 1891 and is headquartered in Chicago, Illinois. It has operations in North America and the Caribbean, Central and South America, Asia and the Pacific Basin, the Middle East and Africa, and Europe and Eurasia.

Spencer Stuart is a global leader in executive search and the adviser of choice to top companies seeking counsel on senior leadership needs. Our clients include leading multinational corporations, medium-sized businesses, entrepreneurial startups and nonprofit organizations across a variety of industries. Founded in 1956 and still privately owned, Spencer Stuart today has 56 offices in 30 countries. Our global reach, leadership in CEO and senior executive searches, and status as the premier firm for board counsel and recruitment give us unparalleled access to the world's top executive talent.

Accretive Solutions is a national professional services firm providing Consulting, Staffing and Outsourcing services.

Classified Ventures operates national online classified ad sites providing automotive, rental, and home listings. Its advertising sites include Cars.com, Apartments.com, and HomeGain.com. Classified Ventures, LLC, is a Delaware limited liability company, based in Chicago. It is owned by a strategic joint-venture of five large media companies including A. H. Belo, Gannett, The McClatchy Company, Tribune Company, and Graham Holdings Company. Its website features local and national automotive listings, photo galleries, videos, reviews, editorial content, blogs, and online calculators, delivering relevant consumer content and offering targeted online advertising services. Classified Ventures was founded in 1997 and is headquartered in Chicago, Illinois.

Brinks Gilson & Lione is one of the largest intellectual property law firms in the U.S. and serves the IP needs of clients worldwide.

Aon is a global provider of risk management, insurance and reinsurance brokerage, human resources solutions, and outsourcing services. It employs over 60,000 people in 120 countries worldwide. ACIA is a unit of Aon, based in Dublin, which was set up in 2009. It is one of the first centers established in Ireland that are dedicated to data analytics and innovation. ACIA provides analytical services that identify and create innovative new products and services for the many different divisions within Aon.