# 30 leading professional services firms in Pittsburgh

Tamtam tracks 32 professional services firms headquartered in Pittsburgh. This list ranks the 30 largest by number of employees on LinkedIn, led by K&L Gates, Michael Baker International and CEI. Their median headcount is 392. Half of them were founded in 1969 or later.

This selection of professional services companies in Pittsburgh features a mix of large and mid-sized firms. The legal sector is well-represented by firms such as K&L Gates, a global law firm, Buchanan Ingersoll & Rooney PC, and Eckert Seamans. Other prominent firms include Michael Baker International, which offers comprehensive engineering and consulting services, and System One, a specialized provider of outsourced services and workforce solutions. CEI provides AI-enabled consulting and IT modernization services, while Aires focuses on global relocation solutions.

A notable pattern among these companies is the strong presence of firms founded in the mid-20th century. For instance, Michael Baker International and PMC were both founded in 1940, while Buchanan Ingersoll & Rooney PC dates back to 1850. Talogy was established in 1946, and Schneider Downs in 1956. This suggests a history of established professional services in the region.

🇺🇸 Pittsburgh · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [K&L Gates](https://www.tamtam.ai/c/k-and-l-gates) (klgates.com)<br>Global law firm providing expert legal counsel across corporate, regulatory, and litigation matters for diverse industries and public sector clients. | Law Practice | 🇺🇸 Pittsburgh | 4,682 |  |
| 2 | [Michael Baker International](https://www.tamtam.ai/c/michael-baker-international) (mbakerintl.com)<br>Comprehensive engineering, consulting, and technology services for infrastructure projects including design, planning, environmental, and program management across multiple sectors. | Civil Engineering | 🇺🇸 Pittsburgh | 4,466 | 1940 |
| 3 | [CEI](https://www.tamtam.ai/c/cei) (cei.ai)<br>Providing AI-enabled consulting, development, and management services to modernize IT systems and drive business growth and operational excellence. | IT Services and IT Consulting | 🇺🇸 Pittsburgh | 1,816 | 1992 |
| 4 | [System One](https://www.tamtam.ai/c/system-one) (systemone.com)<br>Specialized provider of outsourced services and workforce solutions for critical infrastructure, technology, life sciences, and government sectors Offering staffing and technical expertise | Business Consulting and Services | 🇺🇸 Pittsburgh | 1,507 |  |
| 5 | [Buchanan Ingersoll & Rooney PC](https://www.tamtam.ai/c/buchanan-ingersoll-and-rooney-pc) (bipc.com)<br>National law firm providing legal, business, regulatory, and government relations advice to clients in energy, finance, healthcare, and life sciences industries | Law Practice | 🇺🇸 Pittsburgh | 1,272 | 1850 |
| 6 | [Aires](https://www.tamtam.ai/c/aires) (aires.com)<br>Global relocation solutions provider recognized for client partnerships, technology, quality service, and certifications in ISO, FIDI-FAIM, C-TPAT, and Privacy Shield Visit wwwairescom | Human Resources Services | 🇺🇸 Pittsburgh | 1,118 | 1981 |
| 7 | [CLG](https://www.tamtam.ai/c/clg) (alula.clg.com)<br>A consulting firm specializing in behavior-based strategy execution, performance improvement, and leader-led change for Fortune 500 companies Applied Behavioral Science principles drive results | Business Consulting and Services | 🇺🇸 Pittsburgh | 1,042 |  |
| 8 | [Talogy](https://www.tamtam.ai/c/talogy) (talogy.com)<br>Experts in talent management crafting solutions for screening, selecting, developing, and engaging talent worldwide using psychology and technology for data-driven decisions | Human Resources Services | 🇺🇸 Pittsburgh | 1,036 | 1946 |
| 9 | [COGENT Infotech](https://www.tamtam.ai/c/cogent-infotech) (cogentinfo.com)<br>A global consulting firm specializing in digital transformation, workforce solutions, and research & insights, with a focus on nurturing top industry talent | IT Services and IT Consulting | 🇺🇸 Pittsburgh | 869 | 2003 |
| 10 | [Eckert Seamans](https://www.tamtam.ai/c/eckert-seamans) (eckertseamans.com)<br>A national law firm providing a full range of legal services nationwide to businesses, institutions, municipalities, and individuals in various practice areas | Law Practice | 🇺🇸 Pittsburgh | 685 | 1958 |
| 11 | [Schneider Downs](https://www.tamtam.ai/c/schneider-downs) (linktr.ee)<br>A top public accounting firm offering a wide range of services to clients across various industries worldwide through five business units | Accounting | 🇺🇸 Pittsburgh | 661 | 1956 |
| 12 | [PMC (Now a part of Michael Baker International)](https://www.tamtam.ai/c/pmc-now-a-part-of-michael-baker-international) (mbakerintl.com)<br>A leading provider of engineering, development, intelligence, and technology solutions with global reach, offering services in infrastructure and asset projects worldwide | Civil Engineering | 🇺🇸 Pittsburgh | 636 | 1940 |
| 13 | [Orbital Engineering, Inc.](https://www.tamtam.ai/c/orbital-engineering-inc) (orbitalengr.com)<br>Orbital Engineering provides full-service engineering, risk mitigation, and project delivery solutions tailored to meet customer needs across various industries | Engineering Services | 🇺🇸 Pittsburgh | 553 | 1969 |
| 14 | [Dickie, McCamey & Chilcote](https://www.tamtam.ai/c/dickie-mccamey-and-chilcote) (dmclaw.com)<br>A nationally recognized law firm with 21 offices in 11 states, providing comprehensive legal expertise to individuals, small businesses, and corporations | Law Practice | 🇺🇸 Pittsburgh | 418 |  |
| 15 | [CIPRIANI & WERNER PC](https://www.tamtam.ai/c/cipriani-and-werner-pc) (c-wlaw.com)<br>A law firm known for its aggressive and thorough representation in various legal areas including products liability, malpractice, and employment issues | Law Practice | 🇺🇸 Pittsburgh | 392 | 1985 |
| 16 | [Mastech](https://www.tamtam.ai/c/mastech) (mastech.com)<br>This company offers job postings, articles, and information in their LinkedIn company page for potential candidates and interested individuals | IT Services and IT Consulting | 🇺🇸 Pittsburgh | 373 |  |
| 17 | [Burns White LLC](https://www.tamtam.ai/c/burns-white-llc) (burnswhite.com)<br>A dynamic law firm offering innovative legal solutions to clients in various industries and practice areas with a team of over 150 lawyers | Law Practice | 🇺🇸 Pittsburgh | 334 | 1987 |
| 18 | [Aspirant](https://www.tamtam.ai/c/aspirant) (aspirant.com)<br>Strategic consulting firm providing solutions for business leaders in areas of strategy, technology, talent, and community support with focus on domestic violence awareness and victim support | Business Consulting and Services | 🇺🇸 Pittsburgh | 332 |  |
| 19 | [PEAK Technical Staffing USA](https://www.tamtam.ai/c/peak-technical-staffing-usa) (peaktechnical.com)<br>Staffing solutions provider offering contract, permanent, and managed staffing programs across various industries with a focus on engineering, manufacturing, and technology roles | Staffing and Recruiting | 🇺🇸 Pittsburgh | 278 | 1968 |
| 20 | [Gateway Engineers](https://www.tamtam.ai/c/gateway-engineers) (gatewayengineers.com)<br>A full-service civil engineering firm providing innovative solutions with a focus on safety, client satisfaction, and industry expertise in Pittsburgh | Civil Engineering | 🇺🇸 Pittsburgh | 202 | 1954 |
| 21 | [Brunner](https://www.tamtam.ai/c/brunner) (brunnerworks.com)<br>Marketing agency focused on driving measurable results, creating customer connections, and acting as an extension of clients' teams. | Advertising Services | 🇺🇸 Pittsburgh | 192 | 1989 |
| 22 | [Outcome Logix ( A Tech 50 Finalist company 2025 and 2022, by Pittsburgh Technology Council )](https://www.tamtam.ai/c/outcome-logix-a-tech-50-finalist-company-2025-and-2022-by-pittsburgh-technology) (outcomelogix.com)<br>A rapidly expanding technology services firm specializing in developing and enhancing applications for technology and enterprise companies using digital technologies | IT Services and IT Consulting | 🇺🇸 Pittsburgh | 41 | 2020 |
| 23 | [TruSummit Solutions](https://www.tamtam.ai/c/trusummit-solutions) (trusummitsolutions.com)<br>Innovative consultancy firm specializing in Salesforce integration, CRM implementation, and digital transformation, empowering clients to reach their technology peak | Business Consulting and Services | 🇺🇸 Pittsburgh | 37 | 2020 |
| 24 | [Summa Technologies](https://www.tamtam.ai/c/summa-technologies) (summa.com)<br>A digital solutions consultancy focused on human-centered design, strategy, and agile software development to deliver engaging customer experiences | IT Services and IT Consulting | 🇺🇸 Pittsburgh | 33 |  |
| 25 | [Rothman Gordon](https://www.tamtam.ai/c/rothman-gordon) (rothmangordon.com)<br>A Pittsburgh-based law firm providing advocacy and services in legal areas such as business law, estate planning, employment law, and more since 1954 | Legal Services | 🇺🇸 Pittsburgh | 32 | 1954 |
| 26 | [McCrory & McDowell LLC](https://www.tamtam.ai/c/mccrory-and-mcdowell-llc) (mccmcd.com)<br>Offering financial, business, and management consulting services through various divisions, focusing on personalized service, proven solutions, and long-standing client relationships | Accounting | 🇺🇸 Pittsburgh | 26 | 1951 |
| 27 | [CLAITMAN ENGINEERING ASSOCIATES, INC.](https://www.tamtam.ai/c/claitman-engineering-associates-inc) (claitman.com)<br>A Pittsburgh-based engineering firm offering practical solutions with a focus on professionalism and collaboration, creating reliable and efficient design solutions | Industrial Machinery Manufacturing | 🇺🇸 Pittsburgh | 26 | 1965 |
| 28 | [BusinessForward, Inc.](https://www.tamtam.ai/c/businessforward-inc) (businessforward.com)<br>A team offering HR, IT, and technology solutions for business transformation, focusing on advancing clients, people, and community through innovative processes and technology | Business Consulting and Services | 🇺🇸 Pittsburgh | 17 | 2006 |
| 29 | [Sitko Bruno, LLC](https://www.tamtam.ai/c/sitko-bruno-llc) (sitkobruno.com)<br>Innovative law firm offering personalized service, building strong client relationships, and delivering high-quality legal solutions at a reasonable rate | Law Practice | 🇺🇸 Pittsburgh | 15 | 2000 |
| 30 | [BlueGator](https://www.tamtam.ai/c/bluegator) (bluegator.com)<br>Transforming businesses by providing technology solutions that deliver reliable data and insights for informed decision-making, helping leaders to win faster | Business Consulting and Services | 🇺🇸 Pittsburgh | 12 | 2019 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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## The same list elsewhere in United States

- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,079)
- [Professional services firms in New York State](https://www.tamtam.ai/l/professional-services-firms-new-york-state) (955)
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- [Professional services firms in Virginia](https://www.tamtam.ai/l/professional-services-firms-virginia) (344)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
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- [Professional services firms in Georgia](https://www.tamtam.ai/l/professional-services-firms-georgia) (246)
- [Professional services firms in Pennsylvania](https://www.tamtam.ai/l/professional-services-firms-pennsylvania) (245)
- [Professional services firms in Ohio](https://www.tamtam.ai/l/professional-services-firms-ohio) (195)
- [Professional services firms in Maryland](https://www.tamtam.ai/l/professional-services-firms-maryland) (176)
- [Professional services firms in Michigan](https://www.tamtam.ai/l/professional-services-firms-michigan) (173)
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- [Professional services firms in North Carolina](https://www.tamtam.ai/l/professional-services-firms-north-carolina) (142)
- [Professional services firms in Alabama](https://www.tamtam.ai/l/professional-services-firms-alabama) (136)
- [Professional services firms in Minnesota](https://www.tamtam.ai/l/professional-services-firms-minnesota) (124)
- [Professional services firms in New York](https://www.tamtam.ai/l/professional-services-firms-new-york) (735)
- [Professional services firms in Chicago](https://www.tamtam.ai/l/professional-services-firms-chicago) (196)
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## The same list elsewhere

- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)

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Source: https://www.tamtam.ai/l/professional-services-firms-pittsburgh