Early life and education
Pieper was born in Vlaardingen, son of an engineer at a car manufacturer. His father died when Pieper was 20, and on his 18th birthday he suffered a motoring accident which destroyed his sporting career as a player of the Juventus Schiedam basketball team. According to Pieper, both of these experiences instilled him with a certain toughness. Pieper obtained his MSc - Ir - degree from the Delft University of Technology, 1980, in computer science.
Career in the USA
After graduation, he worked for ten years for Software AG (both in Germany and in the United States), where he became Chief Technology Officer for the US branch. After leaving Software AG he was selected to be the Chief Executive Officer (CEO) for Unix System Laboratories in the United States, a division of Bell Laboratories of AT&T. In 1993, after the resignation of co-founder Ralph Ungermann, Roel became the president and CEO of Ungermann-Bass. Ungermann was tied to Tandem by an earlier White Knight deal and Ungermann resigned after his required term. Roel renamed the company UB Networks while it was a subsidiary of Tandem Computers. Roel restructured UB Networks research investments into ATM technology, which was popular at the time, instead of continuing Ralph Ungermann's earlier successful investments and leadership in Ethernet technology. Ungermann-Bass developed the first Virtual Network Architecture (VNA) in 1993. The ATM business was subsequently sold by Roel to Cisco. UB Networks itself was sold to Newbridge Networks successfully in 1996 after Pieper joined Tandem Computers as CEO. In 1996 Pieper became president and CEO of Tandem Computers where he was instrumental in repositioning the company. Under Pieper's leadership Tandem was sold to Compaq in 1997, and Pieper became a member of the executive board of Compaq. During his time in the US, Pieper gained a reputation as a successful restructurer. Under Pieper's leadership, USL, UB and Tandem Computer were successfully restructured and sold to strategic players in the industry.
Career in the Netherlands
Pieper returned to the Netherlands in 1998. For one year he was board member of the Dutch electronics giant Philips by invitation of Cor Boonstra, then Philips' president. This involvement ended abruptly in May 1999 when Pieper got involved in the claimed coding technology of Jan Sloot, a connection Pieper made on behalf of Philips. Philips officially decided not to use the technology. Pieper then decided to support the invention as a private investor and later also as board member, though Sloot's technology was often misunderstood as a compression technology, which led to erroneous articles such as one that claimed such huge compression is mathematically impossible. The inventor died of a heart attack shortly after he demonstrated his technology to a group of 20 investors and technology companies in the summer of 1999. After one year, Pieper ended his employment at Philips with a severance package of undisclosed value.
In 1998, together with ex-minister of economy Hans Wijers, Pieper set up Twinning, an incubator for starting entrepreneurs, particularly in the IT and especially the Internet sector. The project received ninety Million Guilders of government subsidy, and as the Dot-com bubble burst, the ministry decided to sell Twinning to a group of private investors. Of the fifty companies that Twinning started, more than 35 are still operating and some very successfully.
Pieper also independently took part in more than 30 IT businesses all as investor and or adviser. On 1 September 1999 Pieper was appointed as a professor of Electronic Commerce, a newly created chair at the faculty of informatics and technology management of the University of Twente. Pieper ended as a professor of business administration and corporate governance at the university of Twente in 2013.
At the end of 1999, Pieper founded Insight Capital Partners Europe, a private investment fund for IT-businesses, later operating under the name of Favonius Ventures, particularly in the field of e-commerce. In November 2000 he became Chairman of the Board of Lernout & Hauspie, a Flemish company specializing in speech recognition technology. Pieper was instrumental in uncovering a financial scandal at this company, which took place in the period 1996-1999, before he joined the company. In cooperation with the Belgian authorities, Pieper helped to secure information that ultimately led to the formal charging of the founders Jo Lernout and Pol Hauspie. Pieper left as Chairman of the board after the shareholders decided to appoint a new CEO and board.
In 2001, Pieper entered into the board of advisors of Nearshore IT services company, Levi9 Global Sourcing and conducted a study requested by minister Tineke Netelenbos for setting up a system for road pricing, called Mobimiles. Later that year he became president of Connekt, an organisation for addressing road tolling issues in the Netherlands. He presided as Chairman for seven years.
In 2003, Pieper together with a Russian businessman Daniel Bolotin  started the joint venture investment business creating a Netherlands-based company, called European Technology and Investment Research Center (or ETIRC BV). The main project of ETIRC was ETIRC Aviation, sought to establish an Air Taxi network for Europe, Turkey and Russia and a second manufacturing location for the Eclipse 500 jet in Russia for the European market. In July 2008, ETIRC Aviation, based in Luxembourg, which by then had become Eclipse Aviation's largest shareholder, ousted Eclipse Aviation founder Vern Raburn from his position as CEO, and Pieper took over the job of acting CEO for Eclipse Corporation on request of the shareholders and bondholders.
In the autumn of 2008, after Pieper had decided to raise the price of the Eclipse 500 aircraft substantially, several Eclipse customers sued Eclipse for the return of their deposits, claiming they had waited years for the delivery of their Eclipse 500 jets. After the collapse of the financial markets in autumn of 2008, the company Eclipse needed to be restructured and filed for Chapter 11 bankruptcy, with the stated plan that a new company, headed by Pieper, would buy the assets of Eclipse and continue manufacturing. Pieper attempted to secure the necessary funds for this acquisition, but was unsuccessful largely due to the economic downturn, which led to several potential investors bowing out at the last moment. Eclipse Aviation ran out of money in mid-February 2009 and ceased operations and laid off its remaining 850 employees. On February 25, a group of creditors petitioned the Delaware bankruptcy court to convert Eclipse's bankruptcy to Chapter 7 liquidation. Soon thereafter the board of directors (including Pieper) acknowledged the company had no other options but to file for Chapter 7, effectively ending the company's 10-year run, during which it spent an estimated $2 billion in investments and loans. Various reports following the Chapter 7 filing of the company insinuated financial problems for Pieper including an email from Pieper himself 
On 7 April 2009, following the Chapter 7 filing of Eclipse Aviation, ETIRC BV in the Netherlands also declared bankruptcy. The Dutch newspaper de Volkskrant reported that Pieper had invested US$146 million in Eclipse through ETIRC. Roel Pieper has two lawsuits pending on the demise of ETIRC BV. The first case led by a group of consultants who claim to not have been paid for six months was lost. including a delay and review of a case by a legal firm that specialises in take-overs and bankruptcy claims, and Al Mann, who had Roel Pieper sign a 10 million collateral before he would invest 20 million in Eclipse. Al Mann and Roel Pieper have subsequently settled out of court 
This investment was done with non-collateral US$150 million credit of Russian "Sviaz-bank". The Russian newspaper Vedomosti reported that this credit became later an object of an investigation in Russia, of which Pieper was not a part.
At the same time he was fighting to save Eclipse, Pieper was investing tens of millions of dollars in a Russian technology to extract diesel fuel from coal. That project enabled him to attract Russian interest in Eclipse. The Liquid to Coal project is on hold and will restart when oil prices have reached prices again above 100 dollars per barrel.
Failures and successes
Any venture capital investor is expected to have some of its investments fail, and Pieper has been able to keep a good set of results between failures and successes. Various successful companies include Veritas Software, Netwise, Quokka Sports, Google, Tivo, Netscape, General Instrument, Lost Boys, and various others. Some failures include a magazine, Opinio, much older projects such as a web site, Tradingcars.com, and the telecommunications company Stonehenge. Efforts to start MyGuide, a company specializing in GPS navigation units and meant to compete with TomTom, also failed. Roel Pieper has been held accountable by the receivership of MyGuide for the lack of an administration, a coherent strategy and inferior products. There is currently a claim of 2 million Euros pending, which Pieper claims to be fraudulent and erroneous. Pieper recently lost one of these cases 
In 2009 Pieper was appointed CEO of UK-based production technology firm, Pursuit Dynamics. He subsequently left the firm on 15 December 2011 as a result of a conflict with some shareholders who forced a rights issue which was announced after the company failed to meet revenue targets.
In May 2003, the Pieper family was involved in an attack by a confused man who broke into his house in Aerdenhout, and stabbed his wife who made a full recovery. Pieper publicly blamed the Dutch police as the attacker was caught trespassing on the property, including with video proof, on previous occasions. The Dutch police refused to act until the attack almost killed Pieper's wife. Pieper is married and has four children with his current wife. The man who stabbed Pieper's wife was convicted and sentenced to compulsory psychiatric treatment in a closed judicial institute (Terbeschikkingstelling in the Dutch language). He then was granted a temporary leave in 2007. The man has since been reinstated into supervised custody. Pieper emigrated to Monaco in March 2008. The stated reason being that he was not informed, or was informed far too late, by the police or Ministry of Justice of this temporary leave of the attacker, although the government officials had promised to do so in writing.
In the summer of 2007, Pieper became one of the major stakeholders of the Amsterdam Basketball Club and was also working with the city of Amsterdam on a new youth project for integration and education focuses on sports. After Pieper emigrated in March 2008, Pieper no longer was involved with Amsterdam Basketball which closed its doors in April 2011 after it was unable to attract new sponsors to remain in the first league of basketball in the Netherlands. The club BC Apollo has since been revived to become the largest basketball club in the Netherlands with plans to return to the first (ere-) division of basketball after winning the championship in the second division.
- "The Stick of Jan Sloot". Ticc.uvt.nl. Retrieved 2012-02-03.
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- "Roel Pieper nadert faillissement - Nieuws - Sprout, Inspireert ondernemers". Sprout.nl. Retrieved 2012-02-03.
- Marsh, Alton K. (April 2009). "Investor who tried to save Eclipse is bankrupt". Retrieved 2009-04-13.
- "Roel Pieper verliest nog een rechtszaak en moet consultants Etirc €430.000 betalen - Quotenet - de website van Quote". Quotenet.nl. 2010-12-06. Retrieved 2012-02-03.
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- leagle.com (2010-10-19). "ALFRED E. MANN v. ETIRC - Decided October 19, 2010". Leagle.com. Retrieved 2012-02-03.
- "ВЕДОМОСТИ - Крупным планом: Как раздать миллиард". Vedomosti.ru. Retrieved 2012-02-03.
- "Curator MyGuide stelt Roel Pieper aansprakelijk voor ruim €2 miljoen - Quotenet - de website van Quote". Quotenet.nl. Retrieved 2012-02-03.
- "FE Investegate |Pursuit Dynamics PLC Announcements | Pursuit Dynamics PLC: Appointment of new CEO". Investegate.co.uk. 2009-09-01. Retrieved 2012-02-03.
- "FT Alphaville » Roel Pieper". Ftalphaville.ft.com. Retrieved 2012-02-03.
- "The resignation of CEO Roel Pieper". Pdx.biz. Retrieved 2012-02-03.
- "Tbs'er jaagt Pieper naar Frankrijk" (in Dutch). Rtl.nl. Retrieved 2012-02-03.
- Roel Pieper verlaat Nederland - Het Financieele Dagblad[dead link]