HomeCar CultureMarilyn Fox: The first lady of the Can-Am

Marilyn Fox: The first lady of the Can-Am

In a testosterone-driven sport, this driver’s wife earned a lot of credibility


The Canadian-American Challenge Cup Series and its unlimited sports racing cars shook the competitive motorsports world from 1966 to 1974. These ground-pounders are still treated with awe and reverence today. In an age in which the cars were the stars, many of the personalities from that incredible time of Can-Am racing have faded.

In the Road America pit lane with John Gunn in 1973

Nonetheless, never to be forgotten in racing circles is Marilyn Fox Halder. People from that era will tell you she was smart, beautiful and charismatic. A lucky German ex-pat racer named Lothar Motschenbacher, an independent Can-Am team owner and driver, called Marilyn his team manager and wife, this in an era when women were either trophies, stayed home, or were given a clipboard and a stopwatch and put to work on timing and scoring.

Marilyn’s introduction to racing came through her career as a dancer. She had been dancing and entertaining going back to her early childhood. She was doing commercials by day and dancing at the Millionaire’s Club, a private drinking establishment with live entertainment on La Cienega Boulevard in the evenings. The building itself would become ‘OSKO’s’ and was Los Angeles’ most popular nightclub club during the disco-era.

It was there she met Peter and Harry Rothschild. They owned the Powerine Oil Co., a petroleum refinery business founded by their father in Southern California. They were looking to provide high-octane fuel to the racing clubs and tracks and hired Marilyn as a promotional model and “race queen” to represent the Powerine Brand at the races.

“It sounded like fun and I love cars!” she remembers.

That love of cars may never have fully developed itself but for that chance meeting and the new gig.

“I always liked the techie side of how things work,” she explained. “My dad always had Fords, but then he bought a Packard. Dark Blue and it was gorgeous!”

Off to the races Marilyn went.

“At first, I didn’t know where I was going, so I had a chaperone that would take me around.”

Her first race was at Riverside. She also appeared at gas station grand openings. It was at one of these races, a year and a half into her stint, that a soft-spoken German approached her during a race weekend at Santa Barbara.

Lothar Motsenbacher arrived in Southern California from Germany, where he had been an apprentice Mercedes-Benz factory mechanic. He opened his own Mercedes repair shop off Ventura Boulevard and took an interest in racing. By 1962, he had bought himself an ex-Ken Miles Lotus 22 Formula Junior. In 1963 and 1964, he won 32 races, 13 of them consecutively.

Lothar (left) chats up Tony ‘a2z’ Adamowicz while looking over a McLaren Can-Am machine at his shop in Santa Ana, California

Motsenbacher moved up to a Cobra, and then to a King Cobra. From there, he would enter the Can-Am series in its inaugural year, 1966.

He had known Marilyn from the numerous award ceremonies where he was getting trophies, but it was on this particular occasion he offered Marilyn a ride back to Los Angeles. The rest, they say, is history.

Long time pals.. Marilyn with Mario Andretti and Paul Newman

She took a deep interest in the cars that he raced. Being an ace wrench, Motsenbacher built his own engines and had parts neatly organized during builds. Marilyn got quite the education, identifying the parts and watching how they all went together.

In the Can-Am Series, Motsenbacher raced his first season in a McLaren M1B backed by actor Dan Blocker – known to millions of fans as Hoss Cartwright on the hit TV show Bonanza. John Surtees in a Lola T70 would take the very first championship before McLaren would dominate the next five years.

Marilyn remembers that Lothar and Bruce McLaren were quite close. “They both had engineering minds and related easily to each other.”

Marilyn has quite of collection of candid photos from the era (clockwise from top left) Dan Gurney, Peter Revson, Sam Posey, Denny Hulme

Motsenbacher would buy all his privateer race cars directly from McLaren. Motsenbacher’s best championship result came in an M8B in 1970, when he was runner-up to Denny Hulme. Sadly, Bruce McLaren was killed a testing crash at Goodwood before that season began.

It was a dangerous era of racing. Lives were taken regularly. Marilyn had worked in public relations for Carroll Shelby for a bit when Dave MacDonald was driving – and winning with — the King Cobra. In 1964, MacDonald was killed at Indianapolis. Being part of essentially a traveling road show, deep relationships were formed. “I got to know everybody, and they became my family. There was deep camaraderie.”

(Clockwise from top left) Lothar with Stirling Moss and Peter Gethin; Francois Cevert; Jim Hall; Jackie Oliver

An old tradition was regaled by Marilyn. There was a time when the winner would get a kiss from the race queen as they hoisted their trophy.

“I received a wonderful letter from Sherry MacDonald (Dave MacDonald’s widow),” she recalled. “Back in the days when I was a race queen, (Sherry) said ‘the reason I loved you so much was that you would make the wives kiss (the husband winner) before you did.”

But what was the reaction when a driver was killed? “It’s a mindset,” she related. “I think all the drivers have it and don’t even know they do it. They put it behind them and say, ‘I am doing everything right and I’m going to be fine.’ The mind takes over and erases doubt. If you did have a doubt, you couldn’t race.”

(clockwise from top left) Mark Donohue, Roger Penske, Derek Bell, Mario Andretti

As the racing team grew, Marilyn found herself in a management role. She handled everything from logistics to paperwork. “The team would stay on the road and after a race, Lothar would send the engine home to be rebuilt. He would fly back and rebuild the engines himself – we were an independent team, after all. Most times I would stay with the car and get the next race all organized with hotels, paperwork, payroll – even driving the truck!”

Oh, and she also did timing and scoring.

Motsenbacher retired from racing in 1973 but continued to build race cars and do Mercedes restorations. They divorced, but have remained good friends. Marilyn remarried to Rear Admiral (ret.) Bob Halder, a Navy doctor.

Marilyn Fox Halder

She has been very involved in Can-Am reunion events and produced a number of films called Then and Now: Can-Am Memories. She also continues to perform as a tap dancer.

It is charming to hear Marilyn talk about all her old chums from that gilded era of motorsport, a literal who’s-who that most of us can only read about in books. She remembers their quirks, their senses of humor, and their friendships.

She continues to keep up with many old friends from the era, as she puts it, “to tell stories that only we can remember.”

Tom Stahler
Tom Stahler
Tom Stahler is the Managing Editor of the ClassicCars.com Journal. Tom has a lifelong love of cars and motor racing – beginning with the 1968 USRRC race at Road America, in a stroller, at eight months of age. His words, photos and broadcasts can can be found on a myriad of media. He has won the Motor Press Guild’s Dean Batchelor Award and a Gold Medal in the International Automotive Media Awards.


  1. We have known Marylin and husband Bob since 1993. We have traveled extensively with them and have become life-long friends.
    Bob was around during CanAm days as well and together they can paint a mental picture that really captures those glorious days of tire smoke, burned fuel and NOISE. We have attended a few reunions together, primarily Riverside, and through them had the opportunity to meet a number of these legendary drivers. Her extensive collection of Can-Am race footage, pictures and memorabilia certainly attest to her love of that era. She was there through it all.
    Marylin remains an avid race fan, beautiful and full of life!!! Still loved by all who know her.
    Don & Shirley Kingery

  2. Marilyn, Great to see your picture. I used to see you with Lothar I had a 300 SL. I used to take it there when Lothar had a shop in valley. My wife and I were there when Lothar won Santa Barbara in 1965, with his Shelby Cobra. What a great era that was. Those were the days. My best to you. Thanks for the memories. Terry Smith

  3. It was a very special time of my life, I met Lothar and Marilyn when I was 17, long hair and pony tailed and he put a broom in my hand and said sweep the floor your hired. I spent the next 15 years working for a very special man and to short of time with Marilyn. I remember those special mid nights at the shop and he would have my girl friend now wife go and get milk shakes before we would start the McLaren for the next race, the ground was like thunder, Good stuff. It was terrible day when he told me they were getting a divorce, they were suppose to be married for ever in my eyes. They were at my wedding and was our good luck charm. Been married for now for 46 years. And still working on Mercedes Benz cars on what he thought me.
    Thank you for being a part of our lives. Tony and Linda

  4. I met Marilyn Fox in Naples, Italy in the late 80s when she was married to RADM Halder. He may have been a Captain then. Not sure. She was such a gorgeous and charming lady. I never knew of her association with racing until seeing this article. I do believe that she said that she was in an ad for Tareyton cigarettes, one of the “I’d Rather Fight than Switch” ads with the fake black eye.

  5. I met Marilyn at Road America some years back when I raced my Mckee Mk7 Canam. I was always a back marker just happy to be part of the Big Show. Marilyn approached me in the pits with the checkered flag that was to be given to the winner of the Race, She asked me to sign the flag along with the rest of the drivers participating. I said to her ” you want me to sign? ” I’am a nobody” She replied, If your driving one of these cars you are somebody !! I will always remember her words. What a class act she is.

  6. I met Marilyn Fox in the early 60’s when she was Miss Powerine. My father, Don, would drive out to Marilyn’s apt. in Hollywood where she lived with Vicky Carr the singer. Then we would drive her out to Riverside Raceway. It was there my love of racing of all forms was born. I had full access to the pits. I got meet many drivers and hang around their pits. I met Lothar Motsenbacher, Skip Hudson, Ken Miles, Dave McDonald, Paul Cunningham, Roger Penske, Bobby Unser and many more. Those days at the races was awesome!!! My family was also invited to her parents place,Fox,s Snug Harbor in Carlsbad, CA for a day in the sun. I would love to talk to her again.


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