Sisterson Timeline

Built on Decades of Trust

Sisterson & Co. LLP at 90 Years
 

1920s

1920   D.G. becomes partner at Crowther & Company. J.H. Hillman & Sons Company employs Crowther, with D.G. becoming the primary contact soon after.

1923
  D.G. speaks and approves of Andrew W. Mellon’s income tax plan.

1926  
On July 1, D.G. forms D.G. Sisterson & Company along with J.R. Miller and Max Sieger.
First clients are J.H. Hillman & Sons Company and the DuPuy family. Offices are
in the First National Bank Building, which is demolished in 1970 to make way for One PNC Plaza.

1929
 
  • The stock market crashes and the great depression begins.
  • The American Institute of Accountants (AIA)  sets rules of professional conduct.

1930s - 1950s

1937   The Hillman Company buys the Grant
Building out of bankruptcy and moves in – along
with D.G. Sisterson & Co. – from the First National Bank Building.
 
1940s
  • The U.S. enters World War II.
  • The Taft-Hartley Labor Management Relations  Act passes and requires labor unions to prepare  financial statements.
  • The U.S. begins income tax withholding.
1950s
  • Max Sieger’s son, Ed, joins the Firm.
  • The American Institute of Accountants (AIA)  becomes the American Institute of Certified  Public Accountants (AICPA).

1960s - 1980s

Max Sieger1960s
  • In 1964, D.G. retires and Max Sieger becomes Managing Partner of Sisterson.
  • In 1969, a scholarship is established at the University of Pittsburgh in D.G.’s name.
  • Congress passes a law allowing CPAs to represent  clients before the IRS.
  • The Tax Reform Act of 1969 enacts the Alternative  Minimum Tax.
1970s
  • Ed Sieger named Managing Partner of  D.G. Sisterson & Company.
  • The University of Pittsburgh awards the first  Douglas G. Sisterson Fellowship.
  • The AICPA rescinds its ban on advertising  by public accounting firms.
  • The AICPA creates an SEC Practice Section and  a Private Companies Practice Section, both with peer  review and quality control requirements.
1980s
  • Firm grows significantly, roughly triples.
  • Audit practice grows substantially.
  • Bill Troup joins Firm in 1980; he and three others buy the Firm from Ed Sieger in 1984.
  • Dave Simpson named Managing Partner  in 1988.

1990s

1990s
  • Firm becomes Sisterson & Co. LLP.
  • Bill Troup named Managing Partner in 1997.
  • New evaluations and rewards program created.
  • Expansion of consulting practice.
  • Firm admits first female to partnership.
  • Strategic marketing focus.

2000 - present

2000 - 2010
  • Alternate work arrangements introduced.
  • Sisterson joins AGN International.
  • Firm accolades – one of the 50 Best Places to Work  in Western PA and one of the Best Accounting Firms  to Work for in the nation.
  • Dress code moves from ‘business’ to ‘business casual’.
  • The Sarbanes-Oxley Act is passed, creating the Public  Company Accounting Oversight Board (PCAOB) to set  public company auditing standards.
2010 - present
  • Brad Lusk named Managing Partner in 2013.
  • Succession planning focus/orderly retirement  of partners.
  • Formalization and growth of niche teams.
  • Leadership Sisterson introduced, along with Women’s Initiative and Young Professional Group.
  • Sisterson recognized as one of the largest, locally owned accounting firms in the Pittsburgh region.