Removing to Montreal in infancy the Recorder has ever since resided there. He persued his studies at the McGill Normal School; graduated from McGill University with the degree of D.C.L., his thesis being a learned essay upon The Administration of the Old Regeime in Canada.

In 1881 Dr. Weir was called to the bar, and for several years practiced his profession in partnership with Donald MacMaster D.C.L., K.C., AND Mr. Hutchinson, K.C., M.L.A. 
Judge Weir when at the bar took great interest in municipal questions and has contributed many of his studies to the press. In 1898 he was appointed one of several eminent advocates to revise the charter of the City of Montreal, and it is understood that many of the important sections of that charter relating to expropriations and the power of the City to pass by-laws, were written by his hand.

Mr. Recorder Weir has alao cultivated a natural tast for music and is a performer of acknowledged skill upon the pianoforte and organ, but chiefly reserves his performances for the circle of his more intimate friends.He has also published a number of works, amongst which are the following: An Insolvency Manual, the Bills of Exchange Act 1890, the Education Act, the Civil Code, the Code of Civil Procedure, the Municipal Code, besides occasional verse and other contributions to the leading magazines of both Canada and the United States. The Recorder is also professor of Liturgics and Jurisprudence in the Congregational College of Canada, affiliated with the McGill University.

He received his appointment as Recorder on the 6th May 1899 and has assiduously devoted himself to the duties of his office.

Brother of  Hon. William Alexander Weir, Robert Stanley Weir was born in Hamilton, Ont.. Nov. 15, 1856. He was educated at McGill Normal School, Montreal, and McGill University (B.C.L., 1880; DCL., in course, 1897); elected rep, fellow in law, 1910; 

In 1882, he married Margaret Alexander who is prominently identified with the movement for providing playgrounds for children in Montreal. She is the eldest daughter of the late Alexander  Douglas, Montreal. 

When 19 years of age was appointed principal of Sherbrooke St. School (now Aberdeen School), Montreal, then one of the largest public schools there; advocate, 1881; successfully practised his profession in Montreal, having successively as partners, D. MacMaster, K.C., 
M. (now Judge) Hutchison, and Lt.-Col. Hibbard.

Since May, 1899 he has been one of the two recorders of that city; has paid special attention to municipal law, and has written much on its historical aspects. He was appointed to a special commn. named to revise the Charter of the City of Montreal.

Among his publications have been an “Insolvency Manual.” “The Bills of Exchange Act. 1890,” “The Civil Code,” “The Code of Civil Procedure” “The Education Act,” and “The Administration of the Old Régime,” the latter being his thesis for the degree of DCL.

In 1897 he was appointed professor of ch. law and liturgies in the Congregational College, Montreal.  He has frequently contributed in prose and poetry to the leading magazines and has also lectured on musical and literary subjects at various times. He lectured on “Nationalism,” 1911 wrote the words for the song, “0, Canada,” 1908; 

Mr. Weir is V.P. Outremont Golf Club, a member of the executive. committee of the Royal Golf Association and a director of the Montreal Parks and Playgrounds Association.  He is also president of Grace Dart Home. 

Religion: Congregationalist
Residence: 94 Ste. Famille St., Montreal;  summer residence: “Cedarhurst,” Cedarville, P.Q.; 
Clubs: Outremont Golf Club, University Club, Montreal.

According to Joanna: "In May, 1999 a monument was erected in his honour in Weir Memorial Park, along the shores of Lake Memphremagog in the Eastern Townships of Quebec."