Additional theatre credits include David Hirson's Wrong Mountain, Arthur Miller's Broken Glass, Ivan Turgenev's A Month in the Country, and Neil Simon's Proposals.

Rifkin's extensive film credits include Silent Running (1972), The Sunshine Boys (1975), The Big Fix (1978), JFK (1991), Husbands and Wives (1992), Manhattan Murder Mystery (1993), Wolf (1994), L.A.

On television, Rifkin has appeared in numerous made-for-TV movies and miniseries, had regular roles on The Rockford Files, One Day at a Time, Husbands, Wives & Lovers, The Trials of Rosie O'Neill, and Alias, and made guest appearances on a number of series, including Barnaby Jones, The Mary Tyler Moore Show, Sex and the City, The Bob Newhart Show, The Good Wife, ER, Law & Order, A Nero Wolfe Mystery, Falcon Crest, Soap, Hill Street Blues, Smash, and The Outer Limits, for which he received a CableACE nomination.

Rifkin is the reader for a number of audiobooks, including Lois Lowry's The Giver, Phyllis Reynolds Naylor's Sang Spell, and Jerry Spinelli's Milkweed.

In October 2020, a short film, Daddy, was uploaded on Christian Coppola's YouTube channel in which Rifkin stars alongside Dylan Sprouse.