Question: When was the founder of the investment management firm founded in 1975 born?

Context articles: PIMCO
Brandywine Asset Management
Orbis Investment Management
Jackass Investing
Fortress Investment Group
Winton Group
Ray Dalio
Bridgewater Associates
Michael Dever
Southeastern Asset Management, Inc.

Pacific Investment Management Company, LLC (commonly called PIMCO), is an American investment management firm headquartered in Newport Beach, California, with over 2,000 employees working in 13 offices across 12 countries, and $1.51 trillion in assets under management as of 30 June 2016.
 The company provides mutual funds and other portfolio management and asset allocation solutions for millions of investors worldwide.
 PIMCO offers a broad list of investment strategies that encompass the entire risk spectrum and capital structure, including core bonds and credit, structured credit, alternatives, real assets, equities and currencies.
Brandywine Asset Management, Inc. is an American investment management firm founded and managed by Michael Dever.
 The firm is registered as a commodity trading advisor.
Orbis Investment Management is an investment management firm headquartered in Bermuda, with offices in London, Vancouver, Sydney, San Francisco, Hong Kong, Tokyo and Luxembourg.
 The company has a close relationship with Allan Gray Investment Management in South Africa and Allan Gray Australia.
 Orbis manages approximately $25 billion on behalf of both institutional and individual investors.
 Orbis Access, its direct-to-consumer platform, was launched in the UK in January 2015.
Jackass Investing: Don't do it.
 Profit from it.
 is a book written by Michael Dever published by Ignite LLC in 2011.
 Dever is the founder and CEO of Brandywine Asset Management, Inc., an investment management firm founded in 1982.
Fortress Investment Group is an investment management firm based in New York City.
 When, Fortress launched on the NYSE on February 9, 2007 with Goldman Sachs and Lehman Brothers underwriting the IPO, it was the first large private equity firm in the United States to be traded publicly.
 As of June 30, 2016, the firm managed approximately $70.2 billion alternative assets in private equity, liquid hedge funds and credit funds.
 In 2014, Fortress Investment Group was named "Hedge Fund Manager of the Year" by "Institutional Investor" and "Management Firm of the Year" by "HFMWeek".
 Fortress has previously been recognized by "Institutional Investor" as “Discretionary Macro-Focused Hedge Fund of the Year” for 2012, and “Credit-Focused Fund of the Year” for both 2011 and 2010.
Winton Group, Ltd (which includes Winton Capital Management) is a British investment management firm founded by David Harding.
 It is a quantitative investment manager whose trading decisions are guided by models developed from scientific research and mathematical analysis.
 In the United States, Winton is registered with the Securities and Exchange Commission as an investment advisor and with the Commodity Futures Trading Commission as a CTA, and is authorised by the Financial Conduct Authority in the UK.
 The company trades on more than 100 global futures markets in a wide variety of asset classes and on global equity markets.
 The firm was launched with $1.6 million in 1997 and as of 2016 it held $32 billion in assets under advisement.
 Winton Group has nine offices around the world: London, Oxford, Hong Kong, New York, Shanghai, Sydney, San Francisco, Tokyo and Zurich.
Raymond Dalio (born August 8, 1949) is an American investor, hedge fund manager and philanthropist.
 Dalio is the founder of investment firm Bridgewater Associates, one of the world's largest hedge funds.
Bridgewater Associates is an American investment management firm founded by Ray Dalio in 1975.
 The firm serves institutional clients including pension funds, endowments, foundations, foreign governments, and central banks.
Michael Dever is an American businessman, futures trader, entrepreneur, and author.
 Dever is the founder and CEO of Brandywine Asset Management, Inc., an investment management firm founded in 1982, and he is the author of the best-selling investment book ""Jackass Investing: Don't do it.
 Profit from it.""
Southeastern Asset Management is an employee-owned, global investment management firm founded in 1975 by O. Mason Hawkins and the investment advisor to the Longleaf Partners Funds, a suite of mutual funds and UCITS funds.
 Southeastern has approximately 60 employees worldwide, as of December 2013, and is headquartered in Memphis, Tennessee, with additional offices in London, England; Singapore; and Sydney, Australia.
 As of December 2013, the firm had $35 billion in assets under management.