Pius Fey (27 Jan 1855 - 30 Jul 1943) and Henry Jacob Braunig (01 Apr 1861 - Dec 1945) were partners from 1878 to 1909.
A Google search of their names will give all the biography information needed.
An excellent biography of Braunig and account of the partnership is at TexasEscapes.com but see also
Lavaca County Photographers
Portal to Texas History
Pius Fey and Henry Braunig
Portrait of Henry Jacob Braunig
photographer: Fey and Braunig
example from Portal to Texas History