Richter had worked in Construction Claims Consulting at Wagner, Hohns, Inglis Inc., Mount Holly, New Jersey from 1974 to 1976 before he started the firm to provide similar services.

Hill prospered in the late 1970s, in part because of the explosion of local construction projects funded by the newly established United States Environmental Protection Agency (EPA).

[6] At this time, the Nuclear Power Generating Industry was at the end of a rapid increase in constructing plants and began to terminate many projects.

Doyle then served as Senior VP of Northrop Corporation before he became an executive of Hill overseeing much of the nuclear claims work as well as other multi-million-dollar projects.

The firm provided technical expertise in resolving the claims and litigation support, and also helped manage the completion of the construction.

"[7] Hill continued to expand its management role (re: "Troubled Project Turnarounds") at the City of Niagara Falls, New York.

Hill helped the city gain control of the stalled construction of its wastewater treatment plant project and maintain liaison with state and federal regulatory agencies.

Similar troubled project CM work took place at the Point Pleasant, PA, Water Intake and Pump Station.

[citation needed] During this time frame Hill became one of the initial Project Management Oversight contractors[8] (PMOC) for the Federal Transit Administration (FTA) during the construction of the Sacramento (CA) Light Rail.

Also in 1988, it entered the environmental market by purchasing Kaselaan & D'Angelo (K&D), an air-quality design firm that specialized in asbestos clean-up consulting.

[citation needed] In 1981, Hill represented a Filipino labor contractor providing on-site claims and dispute resolution services at King Khalid Military City, a project being built in Saudi Arabia by the United States Army Corps of Engineers.

Its contacts in the nuclear plant claims arena included General Electric (who used Hill services on its Boiling Water Reactor).

GE's overseas subsidiaries also used Hill's services on several claims in Egypt, including the Abu Sultan Power Plant and other projects in the early 1980s.

But as work progressed, the owner, Eurotunnel, and the Anglo-French consortium responsible for design and construction, TransManche Link, were plagued by severe cost, schedule, and safety problems.

For example, thefirm began work on the Athens Metro, the National Library of Latvia, and, in 2002, the Palm Islands Project in Dubai.

Under the terms of the agreement, Hill's shareholders received 14.5 million shares of the common stock of Arpeggio at closing, and owned 63.6% of the combined entity.

With the cash infusion from going public Hill could now begin a series of acquisitions and mergers that would grow the company as Richter had envisioned previously.

[citation needed] Hill made one immediate major acquisition in 2006 after going public – the purchase of J. R. Knowles (the largest construction claims company in the world) for $13 million.

In 2007, Hill implemented its plan to acquire additional project management companies, notably KJM & Associates Ltd., Bellevue, WA.

[15] Due to the civil unrest of the Arab Spring, which commenced in Libya in February 2011, Hill suspended its operations and demobilized practically all of its personnel from the country.

The delays in and lack of payments put a considerable strain on liquidity, which meant Hill had to fund operations through debt financing and equity dilution.

In their offer to Hill, DC referenced two concerns: disproportionate exposure in the Middle East, and the lack of sufficient fiscal discipline to maximize shareholder value, particularly excessive management compensation.

Again in December 2015, DC Capital partners proposed to acquire the company for a reduced offer of $4.75 per share, which still represented a premium in excess of 45%.

[citation needed] Management eventually won this proxy battle, and promised to cut costs, increase margins, and improve shareholder returns.

Bulldog Investors believed these promises were not being met and in 2016 launched a second proxy battle, running on the agenda that Hill's stock price was significantly below its intrinsic value due to what they called the "Richter Discount".

Management fought aggressively to beat the activists, including postponing the company's annual meeting, but Hill eventually settled and put Bulldog's nominees on the board.

[citation needed] After the sale of the Construction Claims Group was finalized in May 2017, David L. Richter, CEO since 2014, stepped down from the role and left the firm.

[citation needed]However, through this period of adjustment, and despite a call to re-focus on U.S. projects, Hill continued to win more international (11) than U.S. (8) contracts for its services.

[21] Hill completed its restatement, became current with its filings, and named Raouf Ghali as the company's permanent CEO in late 2018.

These include providing program management and inspection services for the City of Cleveland on Dominion Energy’s $4 billion pipeline Infrastructure Replacement Program, selection by the European Bank for Reconstruction and Development to provide, as a leader of a joint venture, construction supervision services for the railway rehabilitation and upgrade of the Fushë Kosovë - Hani i Elezit railway line, and a contract to provide construction management services to Supernova Participações for the construction of Expo Park Pampulha, an $80 million multi-purpose complex in Brazil.