EisnerAmper Brand Guidelines: A 1963 New York Firm, a 2010 Merger & TowerBrook

Two practices and one joined-up name.

EisnerAmper is a New York accounting and advisory firm whose name joins two older practices. Accounting Today reported in May 2023 that the Eisner side was founded in 1963 by Dick Eisner and his partner Ted Levine. In 2010 that firm, by then called Eisner LLP, merged with Amper, Politziner & Mattia, and the two names were run together as one word. The same profile says the merger was recognised as Deal of the Year by the Association for Corporate Growth, and that it was overseen by Charly Weinstein, who went on to lead the firm and is now chief executive of Eisner Advisory Group.

According to that 2023 profile, Weinstein saw the merger as a match of two firms with strong technical skills and deep concentrations in their markets, and said the hard part was keeping all the partners comfortable through the transition, because even similar firms turned out to have different practices.

The firm’s own website says simply that it was “founded in New York.” It describes EisnerAmper as one of the largest accounting, tax and business advisory firms in the United States, with more than 4,500 professionals in offices across the country and abroad, serving public and private companies, wealthy individuals, government bodies and other organisations. Its services are grouped under assurance, tax, advisory, outsourcing and wealth management; the last includes a business it calls Prosperity, “an EisnerAmper Company.” Its industry pages run from banking and real estate to life sciences, not-for-profit organisations, and sports, entertainment and media.

EisnerAmper also has an international side. Accounting Today says Weinstein helped found EisnerAmper Global in response to clients, especially those in financial services, and that by 2023 the firm had partners in the United Kingdom, Ireland, Singapore, India, the Cayman Islands and Israel. The website footer adds that EisnerAmper is a member of Allinial Global, which it describes as “an association of legally independent firms.”

Private equity and a split structure.

The largest change to EisnerAmper’s structure came in August 2021. A press release dated 2 August 2021 announced that TowerBrook Capital Partners, an international investment management firm, had made a strategic investment in the firm; financial terms were not disclosed. The deal divided the work between two entities. EisnerAmper LLP, a licensed CPA firm, would provide attest services, while Eisner Advisory Group LLC would provide business advisory and other non-attest services.

The firm calls this an alternative practice structure, and its website says the two practise in that form in accordance with the AICPA Code of Professional Conduct and applicable law, regulations and professional standards. At the time of the 2021 release, the combined entities had more than 200 partners and principals and more than 2,000 employees. Weinstein said then that adopting “a new model of ownership” gave the firm the structure it needed to drive growth.

EisnerAmper describes its 2021 deal as “the first major private equity partnership with a top 20 US accounting firm.” Other large firms have since taken outside capital: Grant Thornton sold a majority stake to New Mountain Capital in June 2024 and has since used the same split between an attest firm and an advisory firm, CPA Practice Advisor reported in July 2026.

In March 2026 EisnerAmper and TowerBrook announced the completion of a continuation vehicle transaction, led by Carlyle AlpInvest with funds managed by Hamilton Lane as co-lead and other investors taking part. TowerBrook remains the firm’s investor: its managing director Walter Weil said in the announcement that TowerBrook was “excited to continue our partnership with EisnerAmper.” In the same announcement the firm described itself as the 13th largest accounting firm in the US, with 475 partners, 4,700 professionals, 43 offices across the country and a presence in nine countries, and said it had completed 27 acquisitions since 2021.

Design and documentation.

Mid-tier accounting networks are built from independent firms that agree to share a name, standards and referrals. The networks in this guide describe themselves that way: their legal pages typically state that the international body provides no client services and that each member firm is a separate legal entity. The brand therefore has to do a lot of work, because it is often the main thing the member firms have in common.

Their identities tend to be restrained. A plain wordmark, usually set in a sans and paired with one strong colour, carries across dozens of countries and languages, and a short strapline or brand promise often sits beneath it. Many networks have moved from long lists of partners’ surnames to shorter names, initials or a single shared label, and some member firms have dropped their local names to take the network brand.

Their websites follow a common pattern. A global map or country selector leads to member firms; service pages are grouped under audit and assurance, tax and advisory, with industry pages for sectors such as manufacturing, real estate, nonprofits or the public sector. Insight articles on tax changes, regulation and technology fill the news pages, and many networks publish annual revenue figures and awards in press releases.

Two further page types are typical of the profession. Transparency reports, which many audit firms publish, set out governance and quality-control arrangements. Graduate and early-career recruitment pages are prominent too, because recruiting trainees is a constant task for the profession. This guide sets out what can be checked about each brand’s founding, ownership and network, and marks clearly what rests on the firm’s own word.

One brand over separate firms.

The acquisitions have continued. On 4 November 2026 EisnerAmper announced that it would add the Sage Intacct consulting practice of RSM US, a team of more than 35 professionals whose work includes implementing and optimising that accounting software, to its Technology Solutions practice. CPA Practice Advisor reported that the deal was expected to close in early 2027; it had been agreed but not completed at the time of writing. The magazine described the two firms as both being among the top 15 accounting firms in the United States.

Firms that join can keep a local presence under the EisnerAmper name, the firm says. In a sponsored article in Baton Rouge’s Business Report in October 2026, the firm said that the Louisiana practice once known as Postlethwaite & Netterville, or P&N, now works as EisnerAmper, with its partner in charge of the Gulf Coast offices saying the staff were “still the same people doing the same work with the same clients.”

The name sits over more than one legal entity. The website states that “EisnerAmper” is the brand name under which EisnerAmper LLP and Eisner Advisory Group LLC and its subsidiary entities provide professional services, and that EisnerAmper LLP is a licensed independent CPA firm providing attest services to its clients.

For a design guide, EisnerAmper shows how a merged firm can keep both predecessor names in a single word, and how one brand can sit over separately licensed entities. Compare RSM, whose Sage Intacct team EisnerAmper agreed to take on, and CBIZ, another US firm reshaped by private capital. For this guide we use a harbour teal, a slate teal and an amber with a sans, an unofficial interpretation; no product or logo is reproduced.

Keep EisnerAmper’s identity on hand — save it to a board in the Made Good inspiration library.