Stephanie Anne Thankful Barry, daughter of Mr. and Mrs. Philip S. Barry of West Los Angeles, Cal. and New York City, exchanged marriage vows last Saturday with Mark William Agnew. The ceremony, celebrated by the Rev. Canon K. Catellanos, rector emeritus of All Saints' Episcopal Church of Beverly Hills, and the reception and dinner dance that followed were held in the Barry's Brentwood Park home where there was dancing to the Michael Carney Orchestra of New York City.

Among the out-of-town guests were Mrs. Robert Harkness, the Virgin Islands, and son Tazwell Coffey; Mrs. Philip Barry, this city; Mrs. Gertrude Legendre, Medway Plantation, N.C., and Mr. Lawrence Baker of Palm Beach and New York City.

For her wedding day the lovely bride selected an Eve of Milady dress of marquisette lace and seed pearls. She is a graduate of Stanford University and an alumna of the Marlborough School in Los Angeles and Miss Porter's School. Her father is president of Philip Barry productions, affiliated with Osmond Television, and her mother is the actress Patricia Barry now appearing on "All My Children." The bride made her debut with the Coronet Debuntante Ball, the New York Infirmary, the International Ball and at a cocktail party at the home of Alice Roosevelt Longworth. She is the granddaughter of Mrs. Paul A. White of Davenport, Iowa and the late Dr. White and of Mrs. Philip Barry of Washington, D.C. and the late Philip Barry, the playwright.

The groom, also a Stanford graduate, has accepted a position with Aetna Life And Casualty.He is the son of Mr. and Mrs. William W. Agnew of West Boxford, Mass. His father is a pilot with American Airlines and he is the grandson of Mrs. Richard Rezac of Santa Rosa, ycal. and the late Mr. A. Ben Echols and of Mrs. William W. Agnew II of Gainesville, Tx. and the late Dr. Agnew.

The couple will honeymoon in the Virgin Islands and will live temporarily in Hartford, Ct.