Lassie was not my favorite show back in the day.
I did watch the show when I was a youngster and I thought Lassie was an amazing dog.
What I did not know until years later was that the gentleman in that photo was my great uncle.
He was my grandmother's brother. Born in Newark, New Jersey in 1915, he pursued acting after serving in the army and landed a few roles on Broadway. He moved to the West Coast to pursue a role in film.
Hugh Reilly was not a well known actor. He was known as Timmy's father, June Lockhart's husband, the other guy.
He acted on Broadway, off Broadway, a few well known soap operas such as the Edge of Night and Dark Shadows.
A Google search revealed a Wikipedia entry. Turns out he turned down the role of the Professor in Gilligan's Island to spend more time with his family!
I remember him as a great, warmhearted, down-to-earth gentleman. I watched him perform at the South Jersey Regional Theatre in Somers Point, New Jersey.
The following is an excerpt from Wikipedia:
Early years and career
Born October 30, 1915 at Newark, New Jersey, Reilly saw service in the United States Army Air Corps during World War II and pursued a theater career following the war. He made several Broadway appearances (including one with Tallulah Bankhead in Dear Charles) before heading to Hollywood for a film career in the late forties. HIs film appearances include Johnny Stool Pigeon (1949), and Bright Victory (1951). Reilly also worked many early television shows such as Kraft Television Theatre (1949), The Ford Theatre Hour (1951), and Broadway Television Theatre (1953).Lassie
In 1958, Reilly joined the hugely successful CBS series Lassie playing Paul Martin, a farmer, husband, and adoptive father of the show's child character Timmy. Reilly debuted in the opening episode of the fifth season, "The Storm" (1958) with June Lockhart opposite him as his wife Ruth and Jon Provost as Timmy.
In 1959, veteran character actor and comedian Andy Clyde was hired to play Cully Wilson, an elderly eccentric farmer and nature lover. When Timmy was scripted into many adventures with Cully, producers felt two adult males on the show would overwhelm the audience and Reilly was consigned to fewer appearances. His character's absence was attributed to workloads in distant fields, grange meetings, or business trips away from home.
As the eleventh season approached (1964), it was evident that young teenager Provost was outgrowing his role. Producers decided to rework the show and sent the entire Martin family to Australia where Paul would teach agriculture. Lassie remained in the States as companion to a team of forestry workers; the Martins were never seen, heard, or referenced again on the show. Reilly made his last appearance on Lassie in the first episode of the tenth season, "The Wayfarers" (1964). He had made a grand total of 140 episode appearances on the show.
 Final years
Following his stint with Lassie, Reilly was offered the role of The Professor on Gilligan's Island but declined, preferring to spend time with his family and performing in theater. He worked television off and on through the seventies (appearing in The Edge of Night) and made final appearances in the early and mid-1980s. In his last years, he often joined Lassie co-star Jon Provost at fan conventions and autograph signings.